Here's my setup. The driver's side works great, the passenger's side less so because of the sight lines.
Amazon - CIPA Stick-On
For mounts, I bent some sheet metal & spray painted them black.
I also have a clip-on wide angle rearview mirror. This is super-awesome, I can see more with this than with all 3 of my stock mirrors, except when my car is packed full of people & gear. Don't get an extra-wide (18") mirror, it will interfere with your visors. I have mine slid all the way left, so it doesn't hang up on the passenger-side visor, and tucks in front of the driver's side visor.
Amazon clip-on