I have my surrounds behind me in the ceiling. They are in the corners of the room. I heard they should really be 90 or 110 degrees from u. I have a wall to mount to on the rihht, but a opening to the left. My ? Is can I mount them at different heights? The place on the left would be about 7-8' cause the opening and I could put up to 7' on the wall side. What are your guys oppions?