I’m confused… is the Eng. plate for P series different than the Eng. plate for H series? Because that’s quite smooth (relatively speaking, but not quite as smooth as super tack pro, or e.g. Darkmoon CFX). It’s not PEI. And glue is required for anything to stick to it, as advertised, according to my experience and most users here. I’ve only seen one person on these forums say anything sticks to it w/out glue. I mean you could just try it and see, depending on the print, YMMV, but I wouldn’t count on it.
I posted some comparison photos of prints from textured PEI, super tack pro, and eng.plate here: Bambu Engineering Plate surface finish - #8 by MaxThreeD
-Max