try scouting fro clamp types, if my memory serves me right, there are some wall mounts in Ace Hardware that tilt sideways and and up-down....don't drill holes in your speakers, though it may not affect the performance, assuming of course the holes dont penetrate the backboard totally, it will definitely reduce the value when the time you want to sell them for an upgrade, which, i can assure you, will happen... heheheh..