I work at a vets and swear by the pet remedy range over the more popular brand. I’ve seen nervous cats roll around playing on the consult table after a spray of pet remedy!
Doesn’t smell that great but it does the job which out weighs the smell.

I like the pet remedy plug ins because they diffuse at a lower temperature than the other big name brand so it just feels safer to leave plugged in.
You can smell the pet remedy diffusing if you’re within about a meter or so of it, but it’s not too strong.