I just install one in my 2016 Miramar. The hose valve was placed on a panel below the Pantry cabinet. It is a access panel to the heating ducts. There I drill a hole in the floor to the bottom storage compartment where I mounted the vac unit.
Under the fridge, there is another access panel where I found the 120v AC for the Fridge, i decided to use that for the fridge and vac. I checked to see if the ckt breaker would trip with powering both and so far it hasn't. I used an extention cord down to the vac from there. Run your cord down the hose hole first before the vac piping.
My vac is in the narrow compartment, which made mounting the unit difficult. Try running the vac hose into the lower compartment from below the fridge into the larger compartment but keep the value in the access panel under the pantry.
Hope this helps.