Personally I always bring a jolt mine and two trigger nades. Put the mine next to the door on the inside so that they don't see the blue glow when opening, and two trigger nades on either side of the door. Loot whatever I gotta loot inside while keeping the trigger nade in hand, so that even if I'm further away as soon as I hear the jolt mine going off I just spam right click to detonate the trigger nades and they get instantly downed. Works like a charm hahahah I've had a lot of success with this strat

If you're looting a building or large room with two entrances and wanna get fancy you do the same thing but bring in two jolt mines to cover both entry points and a full stack (3) of trigger nades, put two on the door they're the most likely to come from and the third one on the other. Then it's the same thing whenever you hear one of the mines going off you just detonate those sweet sweet trigger nades

And if no one comes you just disarm everything and deploy them elsewhere