If at all possible, you really need to get your couch away from the wall. You'll have very ragged bass performance that close to a boundary - not to mention the issues with surround you're talking about.
If you must have it there, at least try to move it out maybe a foot. I've seen several folks use surrounds laid on their backs firing straight up from behind the couch. It's not perfect by any stretch but it does at least give you a litte less directionality to the rears and allows a lot more choice in speakers. It will cause some bass response issues due to basically being corner mounted but having them cut to small will help a little bit. EQ on them will help more.
Bryan
If you must have it there, at least try to move it out maybe a foot. I've seen several folks use surrounds laid on their backs firing straight up from behind the couch. It's not perfect by any stretch but it does at least give you a litte less directionality to the rears and allows a lot more choice in speakers. It will cause some bass response issues due to basically being corner mounted but having them cut to small will help a little bit. EQ on them will help more.
Bryan