Dilos on wander are great for patrolling a yard and dealing with wild critters that break in, like argies or snakes, while a few set to follow will give low-level survivors a chance to run to safety while they keep attacking critters busy.

Get their hp up to 1k and put the rest of their levels into melee and they can even give raptors and sarcos a hard time, while few extra levels into carry weight will allow your security team to also harvest some extra meat and hide for you.