The black wing thing is another camera, it’s just a slightly lower angle, similar to old school on board cameras from the 80s and 90s.
The E is an external trigger for the fire extinguisher, it’s required by regulations:
14.1.8 – Any triggering system having its own source of energy is permitted, provided it is possible to operate all extinguishers should the main electrical circuits of the car fail.
The driver must be able to trigger the extinguishing system manually when seated normally with his safety belts fastened and the steering wheel in place.
Furthermore, a means of triggering from the outside must be combined with the circuit breaker switch described in Article 14.2.2. They must be marked with a letter “E” in red at least 80mm tall, with a line thickness of at least 8mm, inside a white circle of at least 100mm diameter with a red edge with a line thickness of at least 4mm.