Indeed, it is a genuine reason to worry about.
Perfectly packed mirrors have less chance to get damaged.
USE THE MASKING TAPE TO PROTECT THE MIRRORBesides, it would help if you put the masking tape on the mirror.
SECURE THE MIRROR CORNERS WITH PROTECTORSIt is not okay to only protect the glass mirror and to forget the frame.
It is better to cover the corners of the mirror with protectors.
This will also protect the mirror from getting damaged and from dust, dirt, and grime.