The unit comes with a transom bracket transducer that is suitable for either location. Just need a trolling motor mount for it.
Transducer Shield and Saver TM H 8.3
Humminbird AD MTM HW MSI
If you want to wait to do an exchange, you can exchange the transom setup for the trolling motor setup and end up with the same thing as just getting the Humminbird mount. That is handled through Humminbird Customer Service.
The only CHO models now available (Control Head Only) are the G3 DI models for use with the Minnkota MDI transducer.
Humminbird Helix 12 CHIRP SI, Helix 12 CHIRP MEGA SI+ GPS G3N, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2,
Helix 7 CHIRP MEGA SI GPS G3, Helix 10 MEGA DI+ GPS G3N, SOLIX 12 SI, 360, RC-1