I run my switch on the center console on the floor you can see it in the right hand corner of your pics, then I run the front two on the factory fog light switch but I would choose those other guys set ups, haha they are nicer.
The "mount" for the extra switch is already on the back of the bezel. It's just a matter of CAREFULLY cutting out the hole to slide the switch into. As for the wiring, somewhere around here I have the diagram Bob gave me. It's not bad once you know what wire is what.