I should add that placing the monitors in many cars will be a design challenge. You need to put them where they fit (obviously) and where you ca see them, and as I mentioned, where they are not in bright sunshine (maybe add a hood?) and where they don't cause a reflection in a window at night.
And, once you get them installed, there can be a time for you to change your habit - where do you look if you get into a situation, and you need to make a quick look?
The picture above looks like it is of the VW XL1 - so you can look at the car for a possible solution - they put the monitors on the doors, just below where optical mirrors would be.
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