I need to update my signature but we have a 2021 Mammoth (7 month build and 1 delay due to awning issues) with the 12v fridge. So far its been great. My previous Mammoth 2-way fridge performed better with 2 additional fans to push air out the upper vent.
The 12v is a slightly bigger unit I believe and there is no need for the vents. We also have the mid-range lithium package but with the 120 AH batteries. I actually saw the 360 AH cube battery in Randall's office as a demo and they were in the midst of re-engineering their 3 packages. You should have plenty of juice to keep the fridge going a long time!
Good luck to you-