Now, it’s not the cameras or the ball head that we’re talking about. It’s the flat plate on which these things are mounted. This Kickstarter project saves you having to search for materials and drill and tap. It’s all there.
Why not just lay your camera on the ground and shoot that way. Sometimes, that’s just not useful.
In the video world, there’s something called a Baby. You could use one with approprate adapters. But, it won’t likely pack into a camera bag as nicely as this one will.