The area that is right behind the shock absorber weldment to the frame looked like the best place for it, but the area on top of this is under the battery pack.
Pulled out the manual, and after removing the aluminum cross beam behind the seats, 4 bolts, two braces, a bunch of connectors, and it is loose. I grabbed the air inlet and air outlet sides, where there was no metal to touch. The side facing the passenger side of the car has good plastic cover. I figured that the thing had to be field swapable by one guy, so I leaned against the passenger side of the open rear hatch. I grabbed the fan housing with my left hand, and the lifted while my right hand pulled it towards the rear. This got me to the point where the bottom of the pack was resting on the top of the rear wall of the electronics box. I moved to the rear of the car, and again reached the rear with my right hand, and the fan enclosure with the left. I was able to lift it right up so It was comfortable to hold. I easily got it up to my work bench. reversed the process to put it back in.