This is an iPhone mount that sits on top of the LG Ultrafine Display. I made it so that I can use the Continuity Camera of the phone itself.

The slot fits a phone with a case and is 12.5mm in width. The depth of the mount is roughly half the width of the iPhone 13/14/15 so that it can lay on its side and be set at a nice angle.

Using your iPhone camera is a big improvement over the standard LG camera.