I have a bookshelf in the back wall that has all my stuff on it (receiver, games, 3d glass) and normally I would just lean over the couches but pushing up the couches makes it so I'd have to jump over them, which I guess isn't a huge deal. So if you had to choose:
Option 1: push up the couches mount on the back wall and tilt them down to listener
Option 2: leave the couches where they are and mount them to the side walls above ear level pointing down.
Option 3: push up the couches and mount them in the corner and tilt them down to listener
Option 4: burn down the room and start over