It's fine for the main speakers to be near the TV. You still have the advantage in terms of placing the tweeter at your ear level, in addition to less reflected sound energy off the ceiling, back, and side walls. If you plan to do serious 2-channel listening, then putting the speakers on stands is the way to go. If you plan to do casual music listening and home theater, then wall mounting is certainly acceptable. Try it both ways if you can.
Pete - Hsu Research