Photo Party Upload can operate with one photographer’s photos going to multiple tablets OR multiple photographers sending photos to their own, specific tablet. You can use multiple tablets with multiple cameras at the same event -- and each photographer is able to show clients only the pictures that photographer has taken.
There are several ways to set this up. Basically, every tablet is associated with a computer. You can have tablet 1,2,3,4 (and so on) all associated with computer "A". Or you can have tablet 1 associated with computer "A", tablet 2 associated with computer "B," etc. The tablets will be able to pull pictures from the individual computers to which they are assigned. You can manually select which tablet each helper connects with in the PPU app settings.