You can buy a car reversing camera that will run off a USB-to-go connector on just about any modern phone.

Install the cable ( usual 4mm USB size ) into the engine box to the cockpit. Perhaps low down and angled up. Plug in to your phone. If it's right you could even see the engine erect so leave it out if there's something wrong.

Some even have an LED light to illuminate a dark engine compartment.