I would personally step up your choices in fridges.
the unit you referred to appears substandard.
Quality typically starts at $5-600 due to efficiency and safeties built in.
My old ARB allows me to set the shut off at a voltage level.
Saying this, as a factory dual battery diesel owner that has wiped out his batteries with a fridge.
Near perfect world would be a set of stand alone batteries with an efficient charge controller and overkill on the panels with a quality fridge, freezer.
buying ice sounds expensive now....replace two large batteries after walking for help. Ice is cheap!