Rear View Mirror

Please add a rear view mirror or some indication that there's a wall behind me. I play support alot and am usually on the edge of a fight. I'm constantly looking between a teammates health and the position of enemies. I'm constantly trying to move backwards while supporting my teammates who are in front of me. Any kind of indication of the terrain behind me would be helpful. Yes I could just get good at the game and know the exact layout of the map, but who has time for that? I know I'm bad but someone has to play support.