My state (Virginia) issues smaller motorcycle-specific EZPass units. I found an unoccupied hidden crevice between the fairing plastic and the dashboard. The pass is easily « seen » in this location by overhead toll sensors, as there is only RF-transparent plastic above the pass.
I secured the pass 3 ways: (i) Velcro with adhesive backing, (ii) tenacious 3M body trim tape, and (iii) the surrounding structure (i.e., even if the pass came loose, the dash bracket and fairing bits do not leave the pass with much room to move). Between the Velcro and the 3M tape, and with the benefit of prior experience hiding EZPass units on LTs, RTs and GTLs, I believe this EZPass is sufficiently secured.
HTH someone!