Short answer
Place a scent machine where the existing air flow can naturally carry the scent through the desired zone. Avoid closed corners, direct output onto people or materials and positions where the scent immediately disappears outside or into extraction.
Scent follows air
The first technical question is not where the device is least visible, but how air moves through the space.
Ventilation grilles, doors, heating, air conditioning and differences in height all influence the distribution.
Don't aim it directly at surfaces
A professional system should not blow directly onto walls, furniture, textiles, artworks or products. Correct distance and placement help avoid local overconcentration.
The entrance is important, but not always the location
The first scent impression often arises on entry. Yet the device does not necessarily have to be by the door. An automatic door can actually draw scent straight outside.
Sometimes a position further into the space works better, so that the air carries the scent towards the entrance and the visitor flow.
Test hotspots
After installation, the entire space must be walked through. Is the scent strong next to the device but absent five metres away? Then more power is not automatically the answer. The position must be evaluated first.
Discreet but accessible
In commercial interiors, visual discretion is often desired. At the same time, the device must remain accessible for refilling, cleaning and technical maintenance.
A beautiful hidden spot that no one can safely reach is not a good operational solution.
For large spaces
With large volumes, several floors or separate zones, one central location may be insufficient. In that case, multiple machines or HVAC integration are possible.
Professional placement is customised
A floor plan provides a lot of information, but a site visit often only shows how doors, draughts and ventilation actually function.