Supplies included 6" L Brackets
Stud Solvers
Washers that are big enough to cover the hole in the L Brackets, but have holes small enough that the screw won't go thru.
Closeup of Stud Solvers package.
See how the washer, L Bracket and screw go together. You have already put the back part of the stud solver in the wall, and the screw will screw into it.
This shows how the L brackets attach to the wall. You want them to create a shelf for the box to rest on. Use two brackets per box. Be careful on the spacing as you don't want the diagonal dividers to be in the way. I also used some non-slip shelf paper between the bracket and box.