Actually do this for dedicated theaters and wall mounted TV's where possible.
Panamax makes a power conditioner for different load ranges, I run all the power required for the room, screens, projector, TV etc and install a male receptacle for each run. Then the panamax unit cord and plugs to the wall receptacles and viola, conditioned power for the whole room.
And for remote/existing locations, they make an inwall unit that fits into a deep box.
