My 2010 Prius (totaled last week, RIP) had a Dash Disc installed by the previous owner. That might give you some flexibility in where you mount something.
Give this a try, https://www.amazon.com/gp/product/B001DAT0XE/ref=od_aui_detailpages00?ie=UTF8&psc=1 and https://www.amazon.com/gp/product/B010RQWSE2/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1. Although I have the v1 camera which fits just fine. I'm guessing the v2 camera should fit as well.
Arkon 90mm Adhesive Mounting Disk for Car Dashboards Garmin TomTom GPS Dashboard Disc https://www.amazon.com/dp/B001DAT0XE/ref=cm_sw_r_cp_api_.g9XAbSQJMT8
iSaddle Adapter Plate Circular Adhesive Dash / Console Disc with 3M Adhesive Suction Cup Base For Car Dashboards Garmin TomTom GPS Smartphone Dashboard Disc(2Pcs,Diameter About 71mm) https://www.amazon.com/dp/B00IKES3MU/ref=cm_sw_r_cp_api_wh9XAb25EC48F
Problem solved