I needed a wall mounted tablet for home assistant but I didn't want to have it permanently fixed to it so that I could take the tablet away quick and easy to use the tablet.
I used an m4 bolt with the head cut off to hold the two halfs together.
This is the right angle usb-c connector I used.
https://www.amazon.co.uk/dp/B07FPDYRN8/ref=cm_sw_r_apan_glt_i_EKPWKKCAW09SFP48YMP0
The author marked this model as their own original creation.