Found this cheap HDMI 10" LCD with touch and this is my back cover/case / mounting solution
It has a hole for HDMI, 2.1 mm 12V barrel connector and a insert for a USB-C socket.
It came with a USB-A connector but I wanted a socket so I got a USB-c socket breakout board and soldered the touch controller to it.
I used doubble sided sticky tape, for LED strips, to glue the LCD to the case, and added some M3 brass inserts to screw the mount to it.
The author marked this model as their own original creation.