Just took possession of a 2017 Volt. Our state requires a front license, but I didn't want to drill any holes in the bumper. So I built a license plate mount out of a piece of composite decking material (e.g., Trex). Here are some photos.
Since the bolt head was recessed, and I didn't want to cut a hole in the metal big enough to get a socket through, the little screw just keeps the bolt from turning while the nut on the other end of the both is tightened against the toe eye tube. Beyond that and its inherent ugliness, it provides no other function.
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