I’m all for a residential fridge, we have one in our RV. But, how many coach batteries do you have? What size is your inverter? Do you have one? Any solar? Auto gen start?
You may not need all of that, but decent battery capacity and inverter is definitely required.
I’ve seen others with the heater under their fridge say they gave up finding one that would fit. But seems there should be something that should work.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad