The only changes from the wkarraker design was to bisect the model via Meshmixer for printing in two parts due to my smaller printer. I also tried a trick to reinforce the area around the screw holes by adding small slits spaced closely together. This essentially forces the slicer to make solid infills around the screw holes and leaves the rest of the model to infill with standard slicer settings. See screen cap from Cura to see what I mean.
The two halves should need to glue. The screws should hold it to the wall.