Question about Abus Smartvest FUAA35001A Basic-Set

I have installed on 3 floors. The sensors are not connected via WLAN but via a separate radio system that works like WLAN. I have also connected smoke detectors that are even in the adjacent building and it works.

2 floors are possible, but an opening detector would be needed for each of the doors if they are to be secured individually. Wifi is needed.