Bathroom downlights have criteria that is unique to bathrooms, namely IP44 rating, which is rated for wet rooms (but not in showers - I have a separate collection for shower lights). There are two ways to place downlights in bathrooms - in a grid in the ceiling or by relating them to the furniture below. This is down to preference, and the size of the room. The smaller the room, the better it is to tie the lights to the furniture. Try to avoid placing downlights over your tub, you don't want to gaze up into a light source. There are a few downlights with a glass body, which looks fab in bathrooms, boosting the light back onto the ceiling and adding a pretty effect, plus protecting from glare.