Our world is full of tiny high squeaks, squeals and chirps from little rodents, bats and baby birds. We hear the world differently from humans. You humans can't hear these at all.
We can also hear tiny high pitched buzzing and clicking and creaking noises from machinery - from washing machines, dishwashers, smoke detectors, and maybe even radiators. You think these household machines are silent: they are not to us.
So do us a favour. Don't put the litter tray in the utility room where such machines are active. We want some decent quiet and isolation where we urinate or open our bowels. How would you like to have to use the lavatory in the middle of a busy packing factory or a car repair garage?
You'd hate it. We hate it. So we keep our eliminations to a minimum, which is bad for our kidneys. Or we just go outside the tray.
Humans, remember this. We can hear what you cannot.