TTGO520-014+HD2: TomTom GO 520/530, 720/730, 920/930 Friction Mount V2 with Removable Winshield Pedestal
Reviews for other products note the Tomtom Go 720 comes with a short arm that doesn't lift the GPS high enough to work with those products, but this mount includes a longer arm, so it work perfectly with the 720. The arm is highly adjustable, so you can find an angle perfect for you and your car. The weighted base is heavy enough, and the silicon bottom provides plenty of friction, so the unit stays put.