I need to mount 3 fixtures on a 1x1 iron railing that is around an overhang above an entrance. People do not go out on this overhang and the mounting locations are concealed from view below but I was wondering if anyone had a really slick way to mount to something like this. Surface mounts are not an option because I do not want to penetrate asphault roof. Right now I am stuck on the unibracket and either trying to drill out some 1/4 inch holes some kind of U bolt . Anyone have some ideas ?