Ram Mount Ram-D111U-C will work well.
BalZout will also work well if you have a flat surface to mount to.
I have the Red BalZout Mount in stock.....$165.00
It's all coming together and we have you covered @ Shut-Up-And-Fish LLC
for all your Humminbird, Minn Kota & Motorguide needs.
We do Installs!!! 972 737 8161