mounting panel absorbers to the wall

hi, i am in the process of building some of john's slot abosorbers. how should i mount them to the wall?? if i put holes in the wall, sound will escape, right? can i build legs on the botom of the panels & just have the panels stand against the wall? should i hang them from the ceiling? thanks!

Those are all good options. I would think that if your floor is level, the 8" deep absorbers should stand on their own though. But the feet, Maybe a couple of 2x4x 12"s on the bottom of your absorber. Bryan Giles