Hello, I am turning a room into a dedicated home theater and I am having problems with speaker placement. The room is only 22' long, The first 11' is 15' wide and the last 11' is 20' wide. I want to put in a couch for the back row as far as possible so as to use a bigger screen,hopefully on the back wall. But now my problem is the rear speaker, Do they have to be directly behind you or can you put them on the side? Or how about above you over your head? The ceiling in the back of the room starts at 6' and then goes up to 11' at a slant of course. I was thingking of flush mounting them about three feet up from the star of the ceiling, Would that be Ok? I would realy love the help. Thank You..