This is how my 2018 Yukon XL is configured. The mount is a Comet CV2ANTNCG (
https://www.dxengineering.com/parts/cma-cv2antncg). I already had several of the Larsen NMO mounts. I do want to add a ground strap to the mount.
I have cut a few sections of clear PPF to protect the paint where the mount could potentially rub. Performance has been satisfactory. I'm too often traveling with a Yakima-branded photon torpedo on the roof to have a roof-mounted antenna, though I'd much prefer that. I do have power directly fed to the radio from the internal drivers-side fusebox.
Happy to answer any questions about it. 73!