I do the same as Doug -- simple mirror tabs that screw into the wall. If the edge is nasty with adhesive residue or the lead foil housing, I replace that or overlay with copper foil tape, which you can get at stained glass craft stores.

I have all my glass on the walls of my game room. 20-25 total

I'm not home, but if you really want a pic, shoot me an email and I will get you something, likely tomorrow morning.

Good Luck