It can, yes. However, it is only by 3mm. The print orientation is the way it is so that it can survive a hammer and some love taps. (I already tested that, btw.) Additionally, I wanted some extra meat on it for easy removal later and it may be hidden, depending on your application.

In theory, you don’t need the support ring if the hole you drill in your drywall is a perfect fit. I have traditionally drilled my drywall holes a hair small for these kinds of mounts, so if you do that, not using the ring may work. Or not.