Not sure if you have found all the info you needed on this topic...
I use the Ram mount on the left brake reservoir and I like it. I recently found a two piece arm for the ram that makes it even a little better. I use the large. X-Grip from RAM to hold my IPhone 6Plus. I was still worried it may pop out in extreme situations so I found a rubber piece from ram that holds the corners to the XGRip and it is very secure now.
Not saying it is the best solution because it kind of blocks my vision of the speedo a little...I have to look around it a little.
The plus is it is forward in my vision and is easy to click stuff on the phone if I need to while riding. Reaching between handlebars to top of dash never felt comfortable to me on other bikes.