Like Tekdredger, I had been considering mounting the rear surrounds on the ceiling with them firing at the back wall, since my seating is also against the back wall. It seemed like it might work, but I was unsure if my ears would pick up the sound from the speakers before the reflected sound, really screwing up the directional aspects of the surround sound. Another option was using in-walls for the rear surrounds. Again, not perfect but maybe effective. Has anyone tried this or have any comments?