Bike & Motorcycle Phone Mount - for iPhone Xs (Xr, X, 8, 7, 6, Plus/Max), Samsung Galaxy or Any Cell Phone - Universal Handlebar Holder for ATV, Bicycle and Motorbike. +100 to Safeness & Comfort https://www.amazon.com/dp/B015UIPMH2/ref=cm_sw_r_cp_api_i_Z.4cDbNDYW3KW

This Has some good flexibility in mounting, I have mine clamped to a very small diameter fairing holder bar since I too have no exposed handle bars.

I use the bands from another mount I bought but was unable to use as a second securing band. Neither has broken yet.