thin bezel monitors aren't good for this because the webcam mount obscures the screen
even when they do sit, it can be difficult to adjust their angle & position & maintain this over time because monitors can be shaped organically
Design
I've used 1 mm thin walls in single bolt clamps to great effect in many of my designs
there are a few published on Printables now, but I think they don't need to be 2 part clamps – such clamps are overkill & cumbersome to install
I didn't anticipate doing so, but I ended up flipping the webcam hinges 180 deg & installing the mount above the webcam instead in 2 instances to place the webcam even further away from the pole