How to Apply Drywall Corner Bead?

I bought some vinyl drywall corner bead and was wondering how to apply it.

Do I nail it? Plaster under and over it or just over?
A thin layer of joint compound is put down first. Then the corner bead is pressed into place. More joint compound is spread over the top, and feathered out from the corner.
I guess vinyl is different, but the metal stuff in Vegas is nailed or stapled and then textured over.
I’m kinda waiting to hear how this turns out, as I’ve always nailed vinyl beading. The metal beading I set with a clinching tool and rubber mallet, and the vinyl with preattached paper is the only stuff I install with mud alone.