[cjn]

I'm not suggesting that this is an intrinsically better option than the full OEM setup, but it does have the benefits of being considerably less expensive and simpler to install, with no coding required.

I bought mine in the UK, but this kit is probably available elsewhere:
https://www.in-car-install.co.uk/rev...amera-kit.html
(NOTE: I have no connection with this supplier)

It came complete, including the control module that connects into the HU via the quadlock, all cables, and the replacement boot lid handle with inbuilt camera. Installation took about half a day, with a lunch break, and most of the effort was in removing and replacing internal trim. The supplier's 3-page instructions were adequate and are downloadable before purchase, on request.

Compared with the OEM setup, the only obvious difference is the lack of an on-screen menu, but I can't see much benefit in the missing options. The rear PDC markers are provided. I don't know about the relative quality of the video but it's good enough for me.