I have a CCM cat security plate for sale if anyone is interested. It fits the 10-15 Prius liftback, not the V. I will include a brand new hardware kit as well. This particular plate does have a tendency to rattle, FYI. $100. Local pick-up within 50 miles of 94517
For what it’s worth, I have the same plate and it rattled. The middle two bolts on the curved portion(front) and all five rear bolts have a 1/4” thick 1/2” diameter round chrome spacer between the plate and underbody. No more noise, but I did bolt mine in with rivet nuts and M6-1.0 bolts.