Feel free to post back. I only did a quick skim but it looked like it is setup pretty good by default with n enabled on your lower band and AC on the high band. Didnt say what frequency channels they used(normally Auto by default), but hopefully just a matter of plug and play for you.
In that link provided to you, there is a link on that page that will take you through the setup in case you have any changes to the router to get your Ultra working. Basically familarize yourself with how to login to the router with your laptop in case you have to configure the network a little bit.
If Ultra is not seen by your router, edit the 5gz channel to use channel 149-165. (Channels 52-144 cannot be used by roku).
Roku Community Streaming Expert Just another Roku user... I am not a Roku employee. Insignia RokuTV, Ultra 4660, Premiere+ 3921, Express 4k+ 3941, Streambar 9102