By the way, the electrician has now installed Shellys behind all the buttons for the roller shutters. One is located in the control cabinet because it only wanted to go down anymore.
Currently, the signal is passed through for up/down and I have the house full of 12x Shelly WiFi hotspots. As soon as the fiber optic is connected and their router is delivered, I will sit down at the construction site with the notebook and integrate them one by one.
So far I am very satisfied. Thanks for the tips!