I tried putting mine on the inside which did not work well I could never get the correct angle in my car, yours maybe different though. But what did work is I got a blind spot mirror and mounted it on my rear-view mirror and then I was able to see around the entire back of the car with just one glance at that mirror, again my car had lots of side windows which helped also. They are cheap so worth a try in your situation and I suggest carefully testing parked with some bikes or helpers to see that you can see correctly.
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