Steve, I don't think thay make them proud on purpose, I think they make them the width of the opening in the plate, but with a little manufacturing tolerance, a little bit usually rolls up.It might even do it if they are the same width.Since the manufacturer makes both, they can make the contour of the top of the hook the same as the inside of the plate(actually, the reverse).The hooks would be a little shorter than the thickness of the plate,otherwise it would hit the dovetail in the base.
Mike