Sorry for duplicate replies, was getting errors. In my experience it was for both.

Yep - it’s essentially limited by line of sight or a single reflection. I have occasionally seen it go through a closed door but that’s a comparative rarity.

For example I have one that controls both a space heater and a light. It has line of sight for the space heater and reflects off the ceiling for the light. I had to fiddle a bit to get this to work - it didn’t work when inside a book case, for example.