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...Looks like a little access door on driver side underside of rear fascia...
As has been stated, that door can be popped out to install a TOW hook (not a TOE hook!!!).
I think it was sometime during the 2015 model year that they added a tow hook receiver behind the right side of the grill on all Vettes. I don't know, but the rear one may have been on all C7 Vettes from the start of the generation build.
Below you can see the one on the rear of my car:
And below you can see the one mounted to the front:
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