I have an AC-Lite in use in an outbuilding. It is on the ceiling of the first floor. In the rooms above, I have full reception within a radius of 5-7.5m (through the beamed ceiling). So you should be able to cover a 2 1/2 room flat. However, due to the antenna arrangement, I would prefer an upside down installation. You can also turn off the lights with the Unifi controller, but if you can't see it at all, I would mount it in the wardrobe. Hopefully this helped answer your question.