The Factory F-E does not meet our requirements for Driver-Ed, regardless of where it’s mounted. I would suggest getting an approved F-E and mounting it on the Passenger side to replace the factory unit.
If August will be your first DE Event, then as noted above you get a one-time pass on having an approved Fire Extinguisher, but you would still need to remove the factory F-E bottle for the event – just the bottle, not the bracket.