Connecting Underfloor Heating and Two Radiators: TECE Mixing Pump or RTL Valve?

Good morning
As this is my first post, at the beginning, hello to all forum members.

I was renovating the kitchen and I decided to use a floor heating for heating. One loop came out, about 90 m. I plan to connect it in the distribution cabinet, but I have two independent outlets for 2 heaters in this cabinet, which are located one floor above the above-mentioned. kitchen.
And here the question arises, how to connect it? The power supply goes directly from the furnace for eco-pea coal through a PEX 20 pipe.
I was thinking about using a 2in1 splitter, eg TECE with a mixing pump, or is it an excess of form over content and unnecessary costs?
The second solution is a classic manifold without a pump with an RTL valve on the return from the floor heating, but here I am afraid whether the circulating pump next to the stove will be able to push 90 m of the floor heating, and whether the floor heating will not "take" heat from the two radiators that will be connected to common distributor.
I am asking for your opinion / advice on this matter.
PS People who use 2in1 manifolds, please give a short answer whether this solution works.
kisses

This is what I am afraid of that the pump at the stove will be too weak, the more so as the installation is quite extensive and unfortunately unbalanced to the end.
You write to connect the radiators before the manifold, i.e. as outlets on the tees, and behind them the mixing system with the above-mentioned. valve and pump?
Is it something like that?

What about the solution with the TECE 2-in-1 splitter?
I will add that in the future there will be an additional circuit for the floor heating in this cabinet.
Then I would order the smallest such manifold in the 2 CO + 2 OP system and it would significantly shorten the installation.
There was a topic about such a solution on the forum, opinions were divided, and the thread was closed.
Is the principle of operation largely the same as the solution proposed above?

wladewarzolek wrote:

What about the solution with the TECE 2-in-1 splitter?
I will add that in the future there will be an additional circuit for the floor heating in this cabinet.
Then I would order the smallest such manifold in the 2 CO + 2 OP system and it would significantly shorten the installation.
There was a topic about such a solution on the forum, opinions were divided, and the thread was closed.
Is the principle of operation largely the same as the solution proposed above?

Unfortunately, this TECE solution has advantages and disadvantages. The advantages are the simplicity of installation and such a solution takes up less space than the "traditional" solution (separate manifold for radiators + manifold for OP with mixing system). Now the disadvantages: it is a mixing system with a capillary head and here the manufacturer himself states that the temperature of the water flowing from the heat source should be at least 20 ° C higher than the one set in the OP, i.e. if we want to set the water temperature in the OP pipes to e.g. 35 °, the water should flow from the boiler at least 55 ° C. I do not know at what temperature you set your boiler, but for gas boilers, and especially condensing boilers with weather, this type of divider is not very suitable. Secondly - if something breaks, you have to replace the whole thing.
I would suggest a classic manifold for radiators and a two-circuit manifold for underfloor heating or with a ready-made pumping-mixing system, but only with a 3-way or 4-way thermostatic valve (they function better than regulation with a capillary head). Or you turn such a pumping-mixing group yourself.

If I opted for two separate dividers, could they be connected one after the other or would I have to draw separate power supplies from the furnace to each?
As for the temperature, the boiler usually works with a lower temperature, because it is controlled by the weather and a 4-way valve, so this required difference of 20 ° C may actually be a problem for me.
In general, the schematic diagram of the installation is as in the photo below, option I:

But I understand that the proposed by you ls_77 the solution is scheme II?
What to choose now so that it is as cheap as possible but above all reliably?

I would lead 1 pair of pipes: supply + return.
In the manifold box, it is divided into a manifold for radiators (of course with flare valves, drains and vents as it should be) and a separate manifold for the floor heating with a mixing-pump system on a 3-way or 4-way thermostatic valve (of course with flare valves, drains) and vents as it should be).

Here is an example radiator manifold:


Here you have an example distributor for OP:


Here you have an example of a mixing-pump group with a 3-way thermostatic valve:


Here you have an example of a mixing-pump group with a 4-way thermostatic valve:

I created a pictorial diagram as I would see it in my cupboard:

Of course, valves, vents, etc. are obligatory.
I found such a pumping-mixing group:

Wilo pump + ESBE valve, I think that the quality should be ok.

And that's beautiful