One thing you might consider is some kind of baffles in front of your shooting station, upper and sides, that would stop any errant rounds from going over or to the side of the backstop.
Then get your feelings hurt, take your ball and go home. But don't tell me my rights should be restricted due to irrational and unfounded fear. We can do without firearms enthusiasts who claim they are 2A activists who believe in further restricting our right to keep and bear and exercise those rights we already have. We're having a civilized conversation, if you don't have anything to back up your irrational fears, then you're simply trying to legislate by fear - not evidence.
Have a nice day.