AirHost does not currently have a feature to set a minimum number of guests per stay (e.g., a minimum of 2 guests).
If the OTA you are using has a separate setting for the minimum number of guests, it may be possible to configure this directly on the OTA.
However, the items synchronized from AirHost vary depending on the OTA. After configuring the setting, please sync from AirHost, then search on the OTA using both 1 guest and 2 guests to confirm whether the setting has been maintained.
If the OTA setting is not maintained after syncing from AirHost, the minimum number of guests cannot be restricted while using the AirHost integration.