I have a Subaru Outback and the back up camera is basically useless during the winter. I'll clean it before I leave in the morning and it will be covered in filth the next time I put the car in reverse. Even rain seems to cause it grief. Maybe they've improved the design since 2019 though.

When the backup camera isn't covered in grime it really helps with parking though.

On my Renault Megane e-Tech the cameare is placed at the top of the rear window, and due to the small "shelf" on the top of the roof above, it's quite sheltered.

I often find that I forget to wipe the rear window because I have no trouble seeing with the camera.

However the wiper does go over the area covered by the camera, so with snow in particular the wiper works wonders.

Or 6 years from now when the camera fails and is no longer a part available from the manufacturer

On the ascent, it's up very high on the car, slightly under the spoiler. It's got the washer fluid spout right above it, and is at the apex of the curve of the rear wiper, so any grime gets maximum detergent and wiping action. Since it's a tiny little patch, maybe a couple square inches, it's easy to keep clean, as opposed to the whole windshield

Interestingly enough, the actual "backup camera" is mounted lower than the rear view camera, down by the license plate. When you run the rear sprayer, it actually squirts a bit of fluid over the lense of that camera too. Still not as good a solution as Mercedes, who just hides the camera behind a flap when it's not in use, but better than nothing