I like the "V" shaped cameras that easily mount behind the rear view and easily hide the power wires to the fuse box. Less for thieves to target if they can't see it or it looks like it is built into the vehicle.
IMHO, a camera is nearly useless if it doesn't have GPS on board. My first camera required a separate antenna, but that became moot after I dropped it and it was out of warranty. I now have a Rexxing in my car with a rear camera, which was a pain to run, due to the length and complication of running the rear camera in an SUV, required a USB extension and rigging on the rear hatch. My rear camera is not HD and has a limited field of view, and opening and closing the hatch will sooner or later compromise the USB extension.
The camera did pay for itself after a similar accident that you are describing, in which I violated a personal defensive rule to try to never stay in someone else's blind spot. In my defense, I was concerned about loose items blowing around on a flatbed to my left. She'd had the car for two days and was too young to have learned how to set her mirrors correctly. Her Insurance was pi$$y until I posted the video to Youtube and shared it with them and the Investigating Officer.
Be aware that having GPS on your camera can alter your driving style when you realise that now you will have a mute witness to your own driving, especially if you become incapacitated in any accident.
I've recently put a Roav branded camera in my wife's vehicle. It has no rear camera, but video can be downloaded via wifi, if you need it rapidly. Also, if you have a 12v that turns off with the vehicle (we have Honda's) the parking monitor will record any incidents that move the car. It is pretty easy to use.
Roav products are what Anker calls their products designed for automotive applications, I believe.
Here is a link to the ROAV DASH Cam S1 via Amazon:
https://smile.amazon.com/Dashcam-Das...t-items&sr=1-3