There are perks in the Breach Protocol branch which give you buffs if 3 or more daemons are uploaded in the same network:
It is not clear how to use those perks effectively on humanoids as there are only two human-daemons which you can learn from perks: basic ICEpick daemon and the Mass Vulnerability daemon. The other daemons you learn from perks can be used on turrets and video cameras only.
Best Answer
There are two legendary quickhacks which have a passive effect that grants you additional daemons to upload on humanoid targets: