Wahoo is one of the supplied adapters with the Dual Out-front Mount. You simply remove the fitted Garmin style adapter using the two Allen bolts. 

As Wahoo uses a different orientation to Garmin; You'll need to remove the GoPro adapter and swap the bolt mounting position, that way when it's flipped over you can mount the Wahoo adapter in the correct orientation.

there is a video below demonstrating how to install the Wahoo adapter correctly: