I only have rear sensors with no cameras at all, with BOLERO/AMUNDSEN navigation.
I'm thinking on fitting some aftermarket camera in the front grille or even in the front license plate support braket, and connect it through a camera switch (https://www.car-interface.com/vendita/en/video-accessories/616-smart-camera-switch-front-and-rear-camera-smart-management.html?fbclid=IwAR04QfL8AUcoItPSMGQfGsvSObYU00T1msXmYwFejYNniRwRomTJkURXC7Q ) along with a compatible trunk handle camera.
However, i'm not sure what rear camera would work. I presume this one ( https://www.aliexpress.com/item/4000197729171.html ) or an OEM camera would'n connect to the switch. Also, i think that those with RCA connectors don't have adaptive guiding lines ( BTW, are those lines really usefull or not ?). I also presume the switch might need some other VGA to navigation adapter.
Can someone help me clarify this ?