I am in the process of installing coach lighting on the sides of my garage door. The walls on either side are brick. Now, I was told that I need to install electrical boxes at these points for the wiring. This is fine, I've made the holes in the brick and the boxes fit in there just fine. How do I secure these boxes in place? I've run wire and done some lighting before so once I get past this point I should be fine, but I'm not sure how to secure the boxes in place. Do I fill the slight gaps with mortar to hold it in place of nail or screw it somehow?