I use this on my 2021 - though I suggest some quality 3M door edge tape on both the fender edge and hood edge. The mount is secured by one bolt, and while mine hasn’t rotated, I’d expect it to take some paint if it did, does… Hopefully the tape prevents that.
As for an antenna, Just get a larsen NMO mount 1/4wave and cut it per the instructions for GMRS frequencies.
For the NMO mount, I can’t find the link now, but it may have been made by Diamond and had very small coax that was “easy” to route through the rubber feed through behind the glovebox.
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