You could try camping the Esper store inside the mall for player kills. I know when we did the mission to drop off gun oil, electric drill, and C4 in the store, we were always under heavy fire running into the store, so it might be easy pickings if someone comes to do that mission. Obviously not going to find people there every match, but it’s a thought.
edit: watch out for the trip wires. There’s one between the shelves, one on the opening to the back room, and another on the back door in the back room.