I put the Hengs Vortex in the bathroom of my pre-wired 2015 using wire taps (see Ford Idaho's post #4 above).
The pre-wires were run along the side of the vent, on the center side of the RV. They were taut with little play. After removing the vent fascia, I had to pry the metal flashing down to get at the wires and put a putty knife behind the wires, to gently loosen them and make enough room to get the taps over them. I used my wife's cosmetics mirror to see them. I trimmed the leads from the fan so there wasn't any bare wire coming out of the tap. I duct taped the fan sideways in the vent hole just to hold it while I fed the leads to the wire taps and closed them with a pliers. Then I pushed the metal flashing back, pulled the duct tape, positioned the fan, screwed it in and screwed the fascia back on. It wasn't technically hard but its a tight work space.
I used two wire taps, a phillips for the screws, a big needle nose to crimp the taps, a putty knife to move the wires and some duct tape to temporarily hold the fan up. 2 month's and 5000 miles in and it still works fine.
2015 FR3 30DS
Towing 2016 Chevy Sonic LT