Shelf Support Tab

I had been trying to organize my power tools and am using a board under a shelf to mount different printed items (power tool holders, battery mounts, etc) but to get the board in, I had to trim it down, which led to problems when trying to pull batteries off (it would fall down). So I made these tabs to extend the support for the board to rest on. Now it has enough support to keep from sliding too far either way to fall and can be turned to allow the removal of the board if I want to add more mounts. I am using #8 hardware (bolt, nuts, washers from home depot)