Do not block the litter box
Place the purifier close enough to help the room, but not so close that noise, airflow, or the power cord makes the cat avoid the box.
Leave open intake and exhaust space
A purifier needs clear airflow on the intake and outlet sides. Corners, curtains, furniture, and storage bins can make a strong unit perform like a weak one.
Treat carbon as a consumable
Odor control depends on gas-phase media such as activated carbon. A thin or exhausted carbon layer will not keep up with persistent litter odor no matter how strong the fan is.
Keep source control first
Scooping, litter depth, box washing, disposal, ventilation, and pet health matter before filtration. Use a purifier to support the routine, not to excuse a dirty box.
Make filter changes easy
If the purifier is wedged behind the litter area, filter cleaning and replacement will be skipped. Put it where pre-filters can be reached without spreading dust.