Think you'll find your tormentor on top of the purple buildings? Wrong!
Sniper Nest #1: Sneaky. Go outside the map just a bit and the boundary turrets can't shoot you, but you can shoot dozens of helpless victims. Very, very sneaky.
Sniper Nest #2: This location seems awfully limited, but according to that heat patch, enough players must come down those two tunnels to make waiting here worthwhile.
Sniper Nest #3: This area behind the rocks is a sniper's paradise. Drop in and spoil it for them.