Have had constant 15+mph winds lately so plenty of time on aero clamp-on bars since I'm riding solo. I like the following mirror mounted
upside down thus elevating the mirror providing a better view of behind. Due to the winds many of yesterday's solo 111 miles and Wednesday's mostly solo 152 miles were on the aero bars
https://www.amazon.com/CycleAware-He...EQ3ZGXTKEYZ2B8
p.s. -- my preference is for having a plastic mirror near eyes instead of metal