Call the cops in advance- chances are they are staking out your location. Just tell the cops you think you saw someone on your property stealing something. Describe the nigs, maybe a car. Ask for the cops card or number so you can call him with any further reports of them stealing things.
This does two things:
1. Creates a police file of initial contact and establishes the narrative with the cops
2. if shit does go down, call the cop or 911 immediately, then hole up somewhere secure with kill zones you can activate remotely so they can't pop a shot off at you- have an escape route too
3. When the cops do show up, if you hurt any of the nigs they are more likely to think it was in self-defense, you have already built a rapport with them too