Using the adhesive template supplied with your camera or mounting box apply template to the mounting surface.
Using a drill and a metal rated 5/64 drill bit; drill pilot holes in each location marked on the mounting template. Be mindful of what is on the other side of the metal siding, especially if you are running the cable through the wall.
If you are running the cable through the wall drill a hole large enough for the ethernet cable, a 1/2in to 1in drill bit should be sufficient. The location of the hole is marked on the center of the mounting template.
Using sheet metal screws attach the ip camera bracket to the wall. Use hand tools to prevent from stripping the mounting points.