I have a few extra old 8 inch tablets that I wanted to re-purpose. I happen to have two 3D printers and two little laser engravers. So I figured I'd connect the tablets directly to them as touch screens to control them. So I created a 8 inch tablet holder that has opening at the top and side for access to the ports. If you happen to have a tablet with holes on the right you can bring this design into tinkercad and use the hole tool to open up the right side. I also purchased the OTG adapter that allows me to charge the tablet at the same time I can connect usb to computer/mouse/keyboard etc.

Dimensions of slot for Tablet
Width = 8.125 inches
Thickness = .375 inches
Height = unlimited as top is open
Angle of Tablet = 45 degrees