Thx. You must have a vanity plate because you went to the trouble to remove an emblem yet promote your plate.

If you're going to have a plate frame given the chrome directly above yes I see choosing chrome for a plate frame.
I see plenty of white cars with both black and silver in the mix. It can come down to function. The protective trim near the bottom / bumper (even some on grill), fender flares: black. The sport-functioned stuff: black. Other things get chrome / silver. And I do think white in particular is where this can be done well (based on Subarus and a Lexus NX I saw yesterday which somehow had black rails).
So far this thread has been more about about color choice, less on aftermarket rail quality (not that I've helped, plus I want input on both).