Out of these choices yeah. But its overkill. M21 is synthetic and Ultimate Paste Wax is synthetic blend, and both are more focused towards longevity rather than shine.
Ideally synthetic sealants are topped off with carnauba waxes as they are shinier, but as already explained, carnauba on white could cause yellowing.
Personally the only time I top off M21 is with Pinnacle SS II which is a carnauba wax, focused towards shine rather than longevity.