Our two NK fridges, ditto. We usually run them on AC shorepower or genset but also sometimes have the DC breakers on, too. (As when I know the cleaning crew might be aboard, and might accidentally trip our on-board whole-boat AC breaker in the cockpit.)
NovaKool says their fridges will "choose" AC first when available, then fall back to DC if AC goes away or otherwise isn't present.
For completeness: they also say their fridges are always running on DC, anyway. The AC feed, when present, is immediately converted to DC and that's what powers the compressor, lights, etc.
South River, Chesapeake Bay