This can be done with a single enemy if you want to get it out of the way.
"Mind Control" is one of the first mutations in that skill tree for Magnus, you`ll get that character a few hours into the game after rescuing him from some cultists.
Select Magnus as a teammate (under "Team" in the menu), you should have a bunch of skill points to spend. Purchase the "Mind Controll"-skill, with itl Magnus can take control of a humanoid enemy, but not robots or dogs.
Go and find some humanoid enemy, then select Magnus and go near it without entering it`s awareness-area and save the game. Press X to start an ambush, select the skill and move the cursor above the enemy an press A.
After the short animation just load your save - rinse and repeat nine times.