The Stealth hitch part # SH69MR that fits your 2021 Mercedes GLB 250 would not interfere with the hands free liftgate that you have. It also would not interfere with the back up camera either. Normally with hands free liftgates you'd have to kick to either side of the hitch opening for it to operate but since this hitch has it's lower portion that gets removed altogether when not in use it would not interfere at all. view full answer...
Yes, you do have to do some cutting of the heat shield on your 2022 Mercedes-Benz GLB to install the Draw-Tite Max-Frame Trailer Hitch Receiver # DT77YR.
I have added a photo from the instructions (linked below) which show the amount of trimming required. view full answer...