Yes it is mounted to thae swim platform bracket.

Flexing and stress over time is a big concern these models are prone to cracking the gel coat just from the stress of people on the platform.
Overall the mount is 22 1/2" long by 3 1/2" wide and 1/4" thick with a triangle support that goes around the platform support.
With a backer on the inside for added support that is a bit longer and wider(don't know the exact dimensions)

We have tested it up to 15mph wile deployed with no flexing what so ever. Much above that and it is no longer in the water.

The next step is to ad actuators for us as well to be able to swap sides on the fly would be great.