I included 6 backplates. They come in full 100mm height or short 27.5mm height. The 3 variants of each height have either no holes, 3mm screw holes, 3mm screw holes with 6mm wide recesses.

The lips are 4.8mm tall.

My prototype's lip was lower at 2.4mm and you can see that in the picture where my toothbrush is on its lone shelf in the bathroom. My prototype also had 1 of its teeth on the side and it didn't look as nice. The current design is symmetrical.