[RSnic]

eagerbimmer ,

I changed standard Cerium gray grill on my 2020 M340 to on that has gloss black surround with brushed chrome "chiclets."

As for your questions, the grill is merely cosmetic & sits in front of the active grill. Second, I had a challenge in step 3 in lining up the tabs on the side & got some one to assist. With the extra set of hands, lined up tabs & popped them in.

Hope that helps