Handling food related stuff, at least in my country, requires tracking and registering temperature for the fridge. It needs to be documented. Either you have a probe that you bring to computer to read data.. or you send it somewhere.

I don't know lot about fridge internet tech, but I can see that communication is needed to send this data. Having a hub to be able to do it is probably introduces complexity, but also maybe viable solution.

We had a blackout for a prolonged period of time (not 24hrs, but was 12+). Next day thee shop had all the freezers empty. If the "food and safety administration" on your audit catches that you still sold food when temp dropped under x for period of time, I bet you get into trouble.

You also get into trouble if you don't have records to show.