You’ll find a few opportunities to get turret kills by moving the trains in the level. The best place is at the end of the level. Before you activate the console at the end of the map that has the two turrets on tracks. Move the one closest to you so it’s covering the middle of the tracks, then stop it again. Don’t leave the track constantly moving. Once the fight starts, enemies head toward you so just stand on the bottom floor in the back corner(same side as your turret is) and the enemies will just walk right into the turrets. Make sure to shoot the flying drones because all enemies have to be dead for next wave to start.