I tried this a few years ago but ultimately I found something better: https://amzn.to/3PRMGN2 you can get mirrors that are also convex but go over the main rear-view mirror in your car. This was much more intuitive IME. (The link isn’t the exact mirror I bought, I forget which one I got, but that general product there’s probably a bunch)
(You should still test for yourself whether it allows you to see everything, of course)
I tried this a few years ago but ultimately I found something better: https://amzn.to/3PRMGN2 you can get mirrors that are also convex but go over the main rear-view mirror in your car. This was much more intuitive IME. (The link isn’t the exact mirror I bought, I forget which one I got, but that general product there’s probably a bunch)
(You should still test for yourself whether it allows you to see everything, of course)