I installed a different brand of driving lights, and I just found it easier to remove the entire OEM fog assembly and then drill into that square metal piece that the old brackets were screwed into.
Just make sure that you feel up on the other side of where you are drilling. I think I was drilling about 1/2 inch from airbag sensor wires and I was right next to the tranny mount on the drivers side.
BTW, the way I have these things aimed, they light up the area around where my low beams are aimed...then a bit further. I don't hardly use my high beams anymore.
By the end of the weekend I should have my white neon tubes installed behind the grill, then my whole front end should look pretty lit up.