Most airlines train the crew that while "special instructions" might be received as to which doors MAY be unsuitable, you use all available and safe. This includes in unusual attitudes but a caution is given to assess slide angle and may be steep/unusable and if so redirect pax. A380 has slide extension at doors 1 main deck to bridge the distance to ground in a nose up/tail down attitude.
at the end of the day the CC is standing at the door, not the pilot. Although in a potential fire situation I'd be more concerned with wind direction than attitude of the aircraft.