I bought the "12'' Large Convex Rear View Mirror with Suction Cup" mirror off of Amazon and found I couldn't angle it enough to see the kids on the sofa, so I designed just the ball joint piece to extend it out to not have the mirror interfere with the mount.

I may work on a V2 with some ridges to resist rotation.

Link to the mirror:
https://smile.amazon.com/gp/product/B08S75RVTP/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1