I'm a big fan of MarcElbichon's Ultimate Drawer System and it's XL counterpart. I printed the shelves for use in my 3D Printer area to store various supplies, but found that the shelves liked to move when setting on the wire frame shelf.
This clip will fit over a standard 3mm wire shelf, and attaches using the same M4x8mm csk screws and M4 nuts like the shelves.
I recommend putting the clips in the back holes of the shelves, so when a drawer or two is pulled out it will keep the entire unit from tipping forward.
The author remixed this model.
This is a clip that holds the Ultimate Drawer System (and XL) shelves in place when on a wire shelf.