PetaPixel wrote an article on how to swap out a piece on the Godox AD400 Pro so it doesn't tip when mounted on the light stand with a softbox or other modifier.
https://petapixel.com/2020/09/29/how-to-fix-the-biggest-flaw-in-the-godox-ad600-ad400-pro/
https://petapixel.com/2020/09/29/how-to-fix-the-biggest-flaw-in-the-godox-ad600-ad400-pro/