I cut 4"x4" squares or smaller of sound mat, butyl aluminum covered stuff and applied to door while knocking on the outside, doubling where needed. I also installed it to any flat areas on the opposite side, inside of the door.
The adhesive neoprene was installed by covering the interior of the door panel and adding extra layers where there was no interference. (Good place to use your scraps) the more you can get in the better the results.
Then using the vapor barrier as a template, cutout a duplicate 1" removed from the perimeter so the door panel will seat back in place.
The lower panel I fitted the foam in each cell of the the web structure, quite tedious.
I also lined the bottom bin so stuff doesn't rattle.
It is well worth doing, figure on 6 hours to do both doors.