Technically, there is no limit of numbers of RECO Beacons you can manage with RECO Manager Plus.
However, a numerous number of beacons may possibly hinder Bluetooth signals. The optimal number of RECO Beacons for scanning would be 30~50.
Also, physical elements such as walls, windows, and/or other obstacles can reduce the effective signal range. Please be considerate when scanning many RECO Beacons at once.