Optimal location depends on your essential air quality goals. For allergy sufferers, the ideal location would be in your bedroom considering most people spend 1/3 of their life in there. If your allergies are caused by your pets, you may want to keep the purifier where your animals spend most of their time to help control their dander. Odor control is as simple as keeping the CritterZone near the source of the odor: litter pans, kennels, kitchens, bathrooms, garages and garbages… the list goes on.
Ideally, give your CritterZone room to breathe. Air circulation helps the Air Naturalization process and its effectiveness, so oscillating fans and ceiling fans are fantastic. Humidifiers can be helpful, too (See TIPS & TRICKS).