TL:DR

60x60mm clamp from 247generator design with a hole to mount magsafe stand from tdroze design.
Tilted back 20 degrees and rotated 45 degrees towards the user.
Two options included - for left and right sides of the desk to mount.

Motivation

I found tdroze neat design of the magsafe wireless charger which I really liked. I printed it out but it turned to be too easy to accidentally move around the table.

I wanted to have a stand that will hold still and won't move when I attach the phone to it, but didn't want to stick it to the desk with a tape or weight it down somehow, so I came with the idea of clamping the stand to the desk.

Luckily I stumbled upon 247generator's Adjustable Super Clamp project which also had scad file in it which allowed me to remake it a bit so it will allow tdroze stand head to be attached to the clamp.

The hole that I added allows to attach the magsafe stand head and screw it as tdroze does in his split version.

I've set a tilt back of 20 degrees and rotated it 45 degrees according to the left or right position of clamping it to the desk (both versions attached), as I found it to be most comfortable for me to use the phone that way.

The attached pictures are of the left positioned clamp.