I bought mine used from one of the forum members. I attached them to the wall setting the mounting holes inline with the studs. Since some of mine were already cut, I tried to line as many holes to the studs as possible and I used 3 1/2 screws so I got a good strong shelf. Also, when I ran into a situation where I had holes that didn't match the stud locations, I marked the holes and used anchors. The shelves were really sturdy and held a lot of weight.
When it came time to take them down for the move, I pulled all the shelves off the wall and filled in all the holes with pink dap. I've become really good at patching holes in the wall, you can't tell whee they were and when touched up with the correct wall paint no one will ever have a clue where the holes were or that they were even there.
