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If that is a stock bracket, which it looks to be, it's attached through the grille by expanding fasteners. No holes need be drilled through the bumper. If there are holes, someone attached it incorrectly.
IIRC, on my previous 2016 C7 which came with the front license plate holder, it just sort of snaps in place on the chrome strip. We don’t need it here in KY, so I just removed it. Think it just popped off. It may have left a few small rub marks on that strip, but don’t remember it being very noticeable.
Here are the GM license plate bracket, and the aeroplate (most will call the aeroplate a bracket; GM doesn't).
This is the bracket. The black plastic screws visible in the square-shaped wells are used to attach the bracket to the grille.
This is the rear of the bracket. The black plastic screws in the first picture cause the expandable fasteners to open up (like wall anchors) and hold the bracket in place. The metal screws that attach the license plate to the bracket will not touch the bumper. The upper lip of the bracket will contact the bumper and may cause light marring.
This is the rear of the aeroplate. It uses identical expandable fasteners to hold it in place. The rear of my license plate is visible through the two rectangular slots. Note the reliefs molded into the sides that allow the aeroplate to fit over the center grille bar.
That bracket mounts higher than the Aeropanel. It is set at the Legal Height that some states require for the front plate. The Aeropanel fits entirely in front of the grille without touching the fascia above the grille.
The Aeropanel is removable so airflow through the radiator isn't restricted when running on a track.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.
