Doing research for a friend putting together a plasma wall mount with 5.1 speakers all wall mounted. With the wife approved furniture layout, seating will not be directly in front of the plasma, so no seats will be in the sweet spot. I was thinking 3 Mirage Omnisat V2's for the L/C/R would put out the diffused sound he is looking for. But what about three Axiom surrounds mounted against the wall in a line under the plasma? I know they are supposed to be mounted high up on the wall but wondered if they have ever been used like this. Is this a bad idea?