Wireless camera / TV on Nav question

[DE05 LSF]

X5 2005 with European TV module

I want to add a reversing camera & wireless camera;

I've read the articles and past posts.

I've ordered a camera from ebay and about to get a relay. Do I need the AV connection cable from Tvonnav.com and if I do, does that mean I don't need the relay? Or does it just make connecting the TV module easier?

Occasionally I tow a horse trailer, Land Rover do a remote wireless camera that you can situate inside the trailer or over the hitch connection and display the picture on the monitor inside the car. I don’t think BMW do anything similar. So, I’ve found a NTSC 12V wireless 0 lux camera with a receiver with AV connectors on ebay. If I ordered this and connect it to the AV connection cable from tvonnav.com, would I need the TV in motion module for it to display whilst driving?

Thanks