I mount it under the tailight away from the swing arm, because I like suspension travel. :rofl
All road legal motorcycle sold CAME with a DOT approved license plate mounting spot, can’t blame the gov’ for enforcing the law because we choose to modify the OEM mounting location.
Just saying.
*FYI, my R6 also had an aftermarket (read DIY) plate mount that came with the bike. It is under the taillight near the end of the tail, never had an issue with the 5-0’s.