Just play the sound of an electric can opener on the PA every so often
Yours has been the most sensible recommendation I’ve read on ANY thread. You truly know cats. Electric can opener music is in their feline dreams, I’m sure of it!
Ah no, it is the sound of ripping off the top of a can of Fancy Feast.
That Pop sound pulling the key, and then the riiiiiipppp of peeling the lid back.
Thunder on the horizon; approaching felines.
And set up some cat fountains. The vet recommended I get a dome fountain to encourage my boy cat to drink more water after a bad infection. They love it - it’s like the central cat meeting place in the house, hours spent just hangin’ round the fountain.