Spruce - dont you mean rear of the wing?
Certainly at low idle the engine ingestion zone does not extend as far forward as the L1/R1 doors so these would be safe-ISH for egress and evacuation forward of the aircraft.
Doors rear of the engines would be no-go due to engine exhaust gas.
Though saying that in an EJ135/145 type design you could probably evacuate all doors with engines at idle (it would be a bit noisy though)
However, if the flight crew is incapacitated then presumably CC could start evac via L1/R1 whilst one CC enters the flightdeck and pull the fire handles to cause shutdown (thats if CC do have the door code if not fire axe the way in) If the cockpit becomes detached so entry is not possible then the control systems would have severed and the engines would shutdown anyway due to fuel starvation as the pumps will stop running.
Although any impact causing crew incapacitation on impact would be a very severe impact, of sufficient size to cause severe engine damage which will result in shutdown. Any in-flight incapacitation of both crew is unlikely to result in a survivable accident. If you would be lucky enough to survive then the aircraft is likely to be in multiple pieces and the engines again severely damaged resulting in shutdown.