I replaced our 3 way with an Alpicool model.
If you can view my earlier posts there are photos of it installed. I did have to fit smaller height feet as it was a bit tight. Main issue I had was my sink drain was directly above it.
Slightly disappointed with the Alpicool's temperature control, it has adjustable freezer values and fridge compartment. In reality it appears that one change affects the other.
Quite power hungry. I can normally survive 2 nights without
solar before driving off, thats with 2 x 85a/hour gel batteries.