I have found a product that I think cat owners will find very useful. It is a plant that is toxic to cats, and therefore can be used as a deterrent to keep them out of certain areas. The link I am providing includes a link for the plant itself and other details about it. Please take a look and let me know if you have any questions.
Here is the link that I was talking about:
https://www.aspca.org/pet-care/animal-poison-control/cats-plant-list