Currently, automated attackers on corporate property are all low end vandals. That is great for trying things but does make the task a bit of a chore when there is little threat to the events and usually they are unpuppeted making them very one sided operations.
My suggestion is to have a select variety - vandals, maybe someone who is more combative and attacks PCs/NPCs in an area and need to be dealt with, someone who plants an explosive as a higher end rarer one. Maybe spawn rats that need to be dealt with quietly or something. Idk. Things that are good training/day to day work at the corp but allow a variety of situations to go down without need for admin oversite.