You drill them wherever you determine that its the best location for your wires, so theyre hidden by the roof rack, like through/under its brackets, look around. Inside you want to run them along the roof rail wherever you can hide them. You wire them the same as if they were installed somewhere else (per manufacturers instructions) but youll need more wire and to bust out the soldering gun. I did this w/ a toyota p/u w/ shell I briefly had, neighbor gave me a used set of lights. I was unsatisfied as the lights weren't parallel, the left one leaned to the left and the right one to the right (since the roof is curved).