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I've been using star screws to lock my (somewhat desired personalized) plate on my truck, my rear plate was stolen many years ago, and because I had not mounted the front plate (California requires two plates, but few actually have two) I mounted my "front" plate to the rear. Buying the new Yukon XL in 2015, I wanted to get my plates re-issued in the "Legacy", which is Black/Gold, much like Ca. License plates were up until the late 60's early 70's. Once I received my new plates, I mounted the new rear plate with these: /
https://bestlicenseplateframes.com/...crew-covers-plastic-black-not-for-cnc-frames/
They are pretty cool, (the company also offers custom frames, and other trim), but I like the way these work. They screw into your "standard" mount (most of them are all plastic fitted nuts now) but you mount both a washer, and a locking lug onto the screws, once they're snugged down (I also put a drop of "Loctite" on them for added measure) there's a black aluminum cover (they're also available in chrome) that snaps over the screw head, onto the locking lug. You could use Star, Allen, any type of screw you'd like (as long as it's the proper size) and once these covers are in place, there's no way to remove the screws without figuring out how to get the covers off, which also freely spin when twisted, and then have the tools to remove them.
As I mentioned, having had my license plate stolen off my truck (while it sat in my driveway), many years ago, still missing- Probably hanging in some kids (now "man") room or garage somewhere. I've been very happy with it, so far... not to tempt karma.
Regarding the front plate, I removed the dealer installed mount, they're required to sell it "legally equipped", but it came off with two small screws. Unfortunately, the way it was mounted to the front required them to drill two small holes in the front of the bumper. I removed the mount, and painted a couple of stainless steel screws black (using a can of Krylon I already had) and mounted them back in, also with Loctite. It works and isn't too noticeable.
Good luck!