Cut the grill its really not a big deal, they are a dime a dozen. I had reservations about cutting it initially but bought a used grill here and hacked away. That mount you posted is lame, if you got the Rover mount that works with the brush bar and the bumper there is no reason not to use it. I have saved the cut grill for when I sell my Rockware and run the stock configuration again.
Poor gas mileage gets you to the best places on earth