I just bought a light fixture and would like to install it outside on my wall. The problem is that it is a downwards wall mountable fixture and requires me to add a crossbar. My outside wall is brick. Can I use a drill to screw on the crossbar to the wall. I know with drywall, you have to searh for studs. Is it the same or can I just drill the screws ANYwhere in close proximity to the outlet box. Thankx.