I have a nice scrape on my rear bumper from an idiot who tried to do just that.
Last time I was in Singapore I noticed that virtually all cars had proximity alerts - aural. It was a great aid for backing into the narrow spaces in the cramped parking garages. You don’t have to look at anything like a tv screen. Just listen for the beep rate of the detector.
I have a nice scrape on my rear bumper from an idiot who tried to do just that.
That is why we once had road skills test in driving that included parking in all situations. I used to back tractor trailer rigs with 50' trailers through alleys and even make turns in those alleys. They are 100% blind for about 30 ft directly behind. I never hit anyone and never damaged a truck or trailer doing so.
IF a person can't back with their mirrors and by turning their head to start with all the technology will do is confuse them more. Plus a viewing screen adds another distraction to the process when they should be viewing the mirror or have head turned. Truth is many drivers never learned how to properly use their mirrors much less set them for maximum field of vision.
When I back in to park I have a fresh look at the entire situation and I know where the car is in the space behind me. BTW I am parking a three quarter ton full size full W.B. hi-top conversion van when I do this. My vehicle backs it at a 45 degree angle or less and I straighten up the vehicle alignment so I leave others room as well. But better than backing in is this. Try and find a space where you can pull simply pull through to the opposite one in front and park your car headed out. Problems solved. Peoples driving skills are the problem. Gadgets will not fix that.