Dipole/Bipole Speakers on Rear Wall?

My problem is deciding what type of surround speakers to use. The speakers will be placed on a wall that my couch rests against. The listening area is only 12' X 15' with a 12' cathedral ceiling. Even if they're only 6" deep, the speakers will be right in line with my ears when I'm sitting on the couch... Where I plan on placing them, they'll only be 1'- 2' from the end of the couch. I know that moving them up a foot higher than my head would help a little, but can I use the dipole/bipole speakers in such a limited space (No, I can't position them on the side of the room like you really should...), or should I just use direct reflecting speakers and point them inward a bit? I have a small child and 2 dogs, so I want to be able to hang them on the wall. I want to have a 5.1 home theater experience, but I don't know if my room will allow it to be all that it should be...