I'd just get a refund for now unless they can give you a genuine one (kind of like the reversing sensors, factory fitted is much better unless you do what Mav did).
The cost of it would still be cheaper than repairing a rear bumper even if it's just the smallest touch on a bollard or something that isn't visable. I'd still prefer to turn my head to make sure but also look at the screen if that makes sense (mostly just for parking in tight spots or where the visability is rubbish).
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