Stereo image speakers are good for more applications than just outdoor speakers. Niles makes them in indoor/outdoor bracket mount types as well as ceiling mount units. A ceiling mount stereo image speaker is a good choice for zones in a whole house audio system that would be a tough setup for two speakers....such as hallways and bathrooms.

Niles also makes ceiling mount bipole/dipole speakers for tough placements in surround sound applications. If I can snake a wire through the ceiling below the flat roof of my family room (yuck), this would solve a problem with placement of the left side surround since that wall is too far from the seating position to use a wall mount side surround speaker, and a speaker on a stand won't work either. That's why the room is currently only 5.1 setup with the surrounds on the rear wall. BTW they sound better up firing with a bounce off the ceiling.