Anyway dimitri897 there is not enough detail about your project and for now it has nothing to do with remotexy...

You're right, I was going to comment on it today. The funny thing is that dimitri says nothing, only you and I publish.

A hug Guillaume

Most mechanical relays have 2 positions (Normally Open and Normally Closed) so you can use one relay for each blind

If you do it with only 1 relay, you will not be able to leave the blind in a certain position.
The technically correct thing is, that the relay works until it reaches the position and then remains at rest. Both when opening and closing.

I can't help you much, but I'll give you a couple of ideas to keep in mind.

Each blind needs 2 relays. Open - Close.

Each shutter needs 2 inputs to detect opening and closing.

Depending on the type of motor you buy, the Open and Close detectors are already built-in, you do not need inputs to the control PCB. Keep that in mind and save money.

And if you want, as a precaution, use local control buttons on each blind (it will be useful at times, but you will be glad to have it).

For now, I leave these duties to you and someone with more experience to contribute on the control system.

Best regards