I put one of mine in the same location as the above picture.
The other one I wired to a stock switch on the radio bezel
I got a radio bezel from an explorer sport out of the junkyard because it had more switches than mine.
It was a very long time ago so if you want to know how to wire yours to a stock switch I am not the man to ask. I don't even think I did it right because my lights don't always work when I press the switch. But I never need them here in the city any.
Get a bezel from an Explorer that 2 switches in the right side. One for fogs and I think the other was for rear defrost. All you have to do is ohm out the switch and you can figure out the pins on the stock switches.