I recently removed my passenger side outside mirror to gain a little mileage. I have been missing having a mirror on that side, so I made a couple inside ones.
I used convex mirrors to help with the blind spots. What I used to mount them was a brake controller bracket and 3M double sided tape(if mounting to plastic make sure to clean with alcholol and use plastic primer or adhesive promoter)
I cut the brake control bracket in half to give me (2) 90 degree pieces I bent these slightly to align my view point.