These brackets are specifically designed for some spare 17mm thick wood planks I had that were cut to 104mm depth. I also added 2mm chamfers on all edges but the back 4.
The mounting keyholes work well with ‘Walldriller’ drywall screws and I've included an “install tool” to help with location of the screws on the wall as well as the screw head gap.
While there's 2 spots for screws at each bracket, I'm currently only using the top screw with each bracket in my use case.
The author marked this model as their own original creation.