Oh ok I see what you mean.
For now I ordered 1 camera which I will try as a side view mirror replacement and if it doesn't work out I will just use it as a backup camera because visibility out of the back of my tail leaves some blind spots.
I haven't even tried to use wide angle interior mirrors because I didn't think they provided that good of visibility, but I have no experience with them. Maybe I'll have to give it a shot now.
Plus, I think having a camera is pretty cool