In order to hang curtain road outside of the window frame, I need to put a piece of wood same width as window trim in place for a level surface to screw in the rod bracket. How will I attach the piece of wood to the painted drywall since there is no stud there? Can I glue it? No way to hold wood in place until it dries. After wood is attached to make the surface level, how best to attach rod brackets? If glue is possible, would prefer that, but what type/brand would do the best job?