Works without problems over floors. One sensor is outside on another building (as the crow flies 10m). There are sometimes signal interruptions. But still tip-top for domestic use.

I have six sensors distributed in a detached house. Basement, ground floor, 3 on the first floor, two in the attic and one outside. Station is on the first floor and reception is problem-free even from the basement. Concrete floors. I can recommend it with a clear conscience. It would be nice if wireless readout was possible and not via cable and SD card.