Hi,
I noticed that nowadays webcams are sold out pretty much everywhere thanks to corona.If you are still looking, this turnable phoneholder might be the solution for you.Setup this file for your 3D-printer with any slicer software. You can set your phone up as webcam and use this to fix it to your monitor.
I used the thickness of my phone and monitor ( 8 mm for my phone and 18 mm for the monitor)However if you send me your dimensions I can very easily adjust this for you!
I hope my design helps you out!