You don’t knock them out neither tame them. You kill them and get a blueprint of them. You can build those in the City Terminals you find in Sanctuary on Extinction.
They use Element dust you can farm from lanterns in Sanctuary or from other Enforcers or Scouts.
They can teleport (yes onto walls aswell) they can climb on walls and ceilings. They slowly use up Element dust (that powers them)
For a basic enforcer, go around the city and gather at least 500 element dust from lampposts(preferably more), kill a few isolated enforcers until you get 20 oil, go to the wasteland killing the weaker corrupted creatures for corrupted nodules (they can be used as polymer)
When you collect all the resources, go to a city terminal and craft your own enforcer.