I currently have a 3.1 setup consisting of three DefTech Mythos Nine on-wall speakers and an SVS SB-1000 sub, and would like to add two rear surrounds. Due to space constraints, I'd like to go with in-wall speakers. Also, since the main listening position (sofa) is against the rear wall, I'm thinking it make sense to get a speaker that has a tweeter that can be angled inward toward the listener. Alternately, I could put the rear surrounds in the ceiling over the listening position if that would make more sense\/sound better. Looking for suggestions on placement and speaker brands.