I have a 15 cubic foot freezer and a 10 cubic foot freezer.
I use one, depending on how much meat we have and keep it at 100 percent capacity.
If the power goes out, I don't open the freezer and for at least 48 hours everything stays frozen.
We have a generator, but that doe not help if we are gone for a couple days.
I do use a $20 alarm I got from Amazon runs on a battery and displays the inside/outside temperature.Keep reporting in, I have drug my feet on this but want to get something sooner than later.
I'm more concerned about a freezer dying or tripping and going unnoticed vs power outage which is fairly obvious.
I have 14cuft uprights full at the moment and a 7cuft chest empty that I can rotate in as needed.