When one of my favorite male cats began to spray up a storm in the house, his aggression toward a female cat that he had coexisted with for a couple of years dramatically increased. Her world quickly closed down, as did her ability to move about the house freely. She spent all her time under a chair trying to avoid the bully. Thus began house soiling problems with her as well since she was too terrified to brave the trip downstairs to the litter boxes. Do not place it too close to the food and water area as cats do not like to eliminate in the same vicinity where they eat.
Cats are dignified and prefer privacy for such personal acts.
No matter how good a fragrance smells to you, bear in mind that your cat's sense of smell is far superior and what is simply pleasant to you may be repelling and pungent to them. If you are a multiple cat owner, it is strongly advised that you have one litter box for every two cats. No one likes to wait in line to relieve themselves, and cats are fastidious. Keep the litter boxes scooped and clean, and be mindful when washing them to use only mild and unscented cleaning agents. It is important to remember that cats thrive on consistency and familiarity, and are often confused and stressed by changes in their little worlds.