Setting up Night hawk AX1800 MK63 Mesh with Google Fiber

I have Google Fiber and due to fading signal decided to setup my Night Hawk AX1800 Mesh system bought from Costco two weeks ago. In short, Google is not helpful in helping me setup the Router and the mesh, instead they swapped my original network box with dual band with Google WiFi mesh that I assume does not support dual band. Google either points me to their support pages, and or directs me to contact the hardware manufacturer for setup support. I shall appreciate assistance from any of the community member that have achieved success in similar circumstances. Thank You. Prasad R.