Trailer hitch on a Gen 5 Prius

I added a small trailer hitch on my new (to me) 2024 Prius XLS for an attached a bike rack. The bike rack works great and getting the small Class I hitch installed was pretty easy too. The one problem with this setup is that the car thinks there's something it's going to run into when the rack is mounted on the car and you put the transmission in reverse. It does an emergency brake and a loud buzzer (siren??) sounds. I've figured out that turning the PKSB feature off will stop the emergency braking but I haven't figured out how to mute the buzzer/siren. Anybody got a suggestion for that?

 

It may obscure the plate. The hitch itself is directly below the plate so when the rack is loaded with a pair of bikes and the car is moving, it may be hard to read the letters. If the car is parked, the plate is visible regardless of whether the rack is up, down or down and loaded with bikes. As for the tail lights, brakes and turn signals, I believe all are easily visible. The rack itself has no electrical connection or lights on it.