I'm only using it in their crate room, so one infuser is all I need. 2 of the 3 have crate issues when alone, one with soiling, the other with barking.
So I'm hopeful it will help. I'll update over here on this thread after a while. Today I was gone for 4 hours, and no soiling, no barking. I'm encouraged!
I believe that they can help occasionally. The reason they fail is that owners use too few. You need one DAP infuser per average size room. One infuser will not be effective for a whole house.