It is a bolt-on affair, no drilling.
There's two sets of holes on each side of the frame rails under the radiator support, the brackets attach there. One is pre-threaded and the other, there's an anchor like nut that goes into the unthreaded top hole. The skid plate mount to the same points that most front grille/brush guards and bullbars attach to. A few members have posted install pictures of the skid plate and I believe there are pics of modded brackets to accommadate both the skid plate and grille/brush guards or bullbars.