As I posted in the other thread on Trailer Hitches, A Stealth Hitch https://stealthhitches.com/ will fit well on a '16 E-tron with minor modifications to the lower fascia:
viewtopic.php?f=12&t=292
You can choose a 2" or 1 1/4" receiver.
viewtopic.php?f=12&t=292
You can choose a 2" or 1 1/4" receiver.