Tablet / Smartphone universal wall mount

I needed some desk holder for my Huion 420 graphic tablet (or drawing tablet, idk how it is called ahahah), so I designed one. During the modeling, I thought about making this to fit any tablet or smartphone size, so I split it in half in order to make it universal. The holders have a drawing pen holder on the right side, the hole on top is 16.5mm in diameter so it can hold any pen with a maximum diameter of 16.5, and it also has a little hole at the bottom for the pen tip. On the left side, it has a little hook to put the cables. I didn't make it too high in order to follow the lines of the holder. The measurements of the holder are the following: the part inside is 10mm wide, so you can put inside it a tablet or a smartphone with this size. It is 44mm long and 75mm tall. Each side has 2 holes for screws, with a diamiter of 2.8mm and a little chamfer on top to put larger head screws. I also include 2 models without the cable hook and the pen holder if you don't need them to ho