Presence detectors - do I need something special for the bathroom.

[Amenophis]

The Steinel True Presence is just right for something like this. However, he has problems every now and then, there is a very detailed thread.

[ergo14]

Are there any presence sensors that the group suggests as good quality?

I plan to get BEG PD11-KNX-FLAT-DX-DE LUXOMATnet KNX presence detector.

Average room size is 20m^2 - I'm not sure if that kind of sensor would be enough. Also in my bathroom there will be glass wall between the shower and the rest of the room. So maybe I need some other sensor different than pir?

Should I look at Steinel or other offerings? I want the sensors to be ceiling mounted and not stand out for human eye.