Centralized Roller Shutter Control: F&F STR Controller, Installation Diagram & Wiring Tips

Hi.
I put the installation under the blinds at home and because I have a few small windows on the ground floor, I don't want to fly from window to window and leave them separately. I read, among other things, on an electrode about the possibility of centrally controlling roller blinds on the example of the F&F STR roller blind controller, and I do not hide that I liked this idea.
I just wanted to ask you if my vision is correct, or if I choose the right cables - although I assume that it's better by one too much than too little.
The scheme is as follows:


RR - main switchboard
W1 ... W2 - roller shutter connectors
R1 ... R5 - blinds

In the switchboard I want to put 5 pieces of the STR 421 roller blind controller and from each roller blind to the switchboard lead a 4x1.5 cable. Then, from the W1 connector, which will be responsible for the central control of the blinds, also lead the cable to the switchboard 4x1.5. The W2 connector will be responsible for the operation of the W5 roller blind and a 4x1.5 cable will also be routed to it.
Well, does 4x1.5 have to go to the connectors or can you give 3x1.5, for example? In the diagrams on the F&F page, two wires go to the connectors: L and N, and adding optimally PE, three wires come out.
I just had one more question, because STR 421 is programmed for the time the roller blinds are lowered / raised. In the event of a power outage, will the programmed time be deleted (need to be programmed again)? Because how does it spoil the whole concept.
Ahh, and most importantly - I don't know what the blinds will be. The installer only said to lead 4 wires to the blinds, so I assume that the most ordinary.

This is one issue, but I have another question - on the first floor raising and lowering the blinds will be on ordinary connectors, i.e. each separately - can you give a 3x1.5 cable from the power supply to the connector or do you also need to put 4x1.5? I am asking because I have seen so many different and conflicting answers / schemes that I prefer to make sure ...

4x1.5 cable for each roller shutter motor. For up / down switches (momentary), you also give 4x1.5. just in this STR 421 constant N comes and two feedback signals come back. This fourth wire is PE. you will not use it properly and it will only figure, but it will be much easier to buy 4x1.5 PE than without, and never connect anything other than PE on the yellow-green wire.

Generally, it's better to give 4x1.5 everywhere and pull it to one point. This will give the installer flexibility in assembly, or if you want to change drivers.

As for the first floor, set up a separate small switchgear, it will facilitate what life in the future will be like adding service via the internet. In a few years it will be so cheap that you will regret it. I almost regret that I did not make a central switchboard only for blinds.