Firstly, you want to make sure to put your air purifier in a room that is equipped to handle, size-wise. As for placement within the room, a central location will make for the most efficient air purification. In order to avoid tripping over it, however, it's fine to put your air purifier in a more discreet location, just be sure to understand where its input and output vents are located and make sure those pathways aren't blocked. Near doorways and vents that are also creating airflow may help with your air purifier's efficiency.