Offices differ from homes in three ways that change the specification. Occupancy is high, so CO₂ and exhaled aerosol matter alongside particulate. Noise tolerance is low, because a purifier audible during a call gets switched off. And nobody owns the maintenance, which is why so many office purifiers are running on filters two years past replacement.
Be realistic about what a single desk unit does. In an open-plan floor with continuous air movement and hundreds of square metres of volume, a 200 m³/h purifier beside your monitor creates a modest local improvement and nothing more. It is not worthless — your breathing zone is where exposure happens — but it is not floor-wide air quality, and it should not be sold to you as such.
Closed cabins and meeting rooms are where a standalone purifier genuinely performs, because they are the sealed, defined volumes the technology is designed around. A 10-person meeting room with the door shut for an hour is exactly the case for a correctly sized unit.
For a whole floor, the honest answer is usually the building's HVAC rather than a row of standalone units: upgrading the AHU filtration and increasing the fresh-air rate addresses both particulate and CO₂, which no amount of recirculating purifiers will do.