My OMP one has nuts welded over two holes in a channel which is in turn welded to the bottom of the crossmember, these secure the front.
There are two pieces of angle iron welded to the chassis rails further back with the horizontal bottom part just below the height engine mount beam. These have a clever fixing for the guard which consists of two large washers kept apart by a nut with a vertical bolt through the lot, through the angle and nut on top. One on each side, making a tophat shape. Hard to explain, easy to do. The plate has two notches in its back edge which allow you to line up with the tophats, push it between the washers and bolt up vertical at the front, it takes seconds to fit and remove.
Oh, it's easier and better than Huggys, no disrespect.