If you only have 1 foot or even a few feet behind the couch, I wouldn't bother with 7.1. The surround speakers and especially the rear surrounds in a 7.1 setup are mostly for ambience and the occasional direct sound where the mixing engineeer intended the sound to come from behind you; in other words they aren't utilized all that much.
In a small room you can get surround effects from even two speakers up front (because the sound bounces off the walls). A well done 5.1 setup will be much better than the overkill of extra rear surround speakers for 7.1, IMO.
Still, if you really want to experiment with 7.1, I would suggest dipole or bipole speakers to spread the surround info around. Regular monopole speakers one foot behind you will get really annoying really quick.