You undoubtedly have the best of both worlds. Rugs that don’t grumble noticeably, and shed tentacles being discarded at NNB’s house rather than yours, unless you have a very severe mess under the fridge. If it doesn’t smell funny, I’m not worried.
We cleaned out under the refrigerator fairly recently, when some kind of food spilled off the counter into the abyss. There was no sign of a live rodent at that point. DP’s going to put out a glue trap tonight in the pantry and see what we get. There are open packages of pet food in there, so it’s an obvious place for a mouse to lurk, even though I’m not seeing movement or droppings.