I have never seen a grill permanently mounted on the bumper, my guess is all that bumping around and vibrations would cause it to fall off or fall apart. The only thing you can do is mount a swing out arm that holds a grill in which the grill is not permanently mounted.
Loving wife and 2 beautiful daughters.
Chocolate Lab, Lily
2014 Dodge Ram Laramie Hemi 5.7 with 3.92
2014 Dutchmen Kodiak 290BHSL
ProPride 3P Hitch
Progressive Industries EMS-PT30C
Love my Weber Q1200
Me a Happy man on retirement!!!