Saw this sub and the main Mazda sub both clamoring over 3D MAXpider products. So I ordered their all-weather mats which fit the edges of every crevice perfectly, so I immediately got back online and ordered their cargo mat as well. Wanted one that fit the space for general daily use.
Knowing that I'm going to have the bike in the back often and likely covered in gravel/debris, I'm considering getting another cover just to stretch the full length of the back for extra protection. Like that it shows it covering the bumper as a precaution for loading the bike in. Like u/rsachs57 mentioned, one slip and the bumper is done for, hands were sweaty after a ride and I about made a big mistake.
Here is the cargo mat, fit my ‘22 just fine.