I thought about something like that mounted high, but was concerned they would block riders vision at an important moment. Will keep thinking.
I use one on the right to see over the top of camper trailer and it also allows me to see whats in my blind spot. The one on the left is purely for blind spot and is mounted lower. They give a lot of extra vision,
although I still do the mandatory head checks
. I have never had them block my forward vision no matter the lean of the bike.
http://www.saeng.com/product.php?id=803&category=61These ones mount on the inside of the screen out of the wind. They got better reviews than the ones that mount off the screen to the side of the screen. They seem to blow loose.
I haven't viewed the mirrors from the rear seat as there isnt a pillion around at the moment so I am not sure if they will help your situation.
Note - Their cockpit mount bolted perfectly onto the handlebar of the St1300 for mounting my video camera. Great products
Cheers