Amie, a question for you, do you know how thick the MDF is in the back of the speaker? I think it would be safer not to drill where there are joints as this could theoritically cause the joint the seperate; there isn't a cross section schematic that you could provide, is there? Also, since the speakers are glued together and made to stand rather than hang is there a risk of the joints loosening since the force of gravity would now work in the opposite direction?

In terms of sound placement I think that there's an advantage to hanging them in my room as I'll be able to place them further away from the wall than before. In the past I couldn't afford to put them more than 3 - 4" away from the wall.