Thanks to all on this forum I now have NF with Dolby Vision and Atmos!
I was quite a slog, no clear instructions I could find. I had Kodi 18.3 installed, but I rarely used it, only for 1080p content if that. Plex and Jellyfin are my tools of choice. I read here I needed Kodi 19, so I upgraded to that, but the app for NF would not satisfy dependencies. Tried to find a way to roll back and keep my settings, but after hours of research I gave up and nuked my install. Reinstalled 18.6, but found I needed the 32 bit version, not the 64 bit version. Finally got that installed and running, and had a hard time getting the repository I needed uploaded to the FS Kodi install. Discovered Kodi can see my laptop using the last option on the list - sorry can't recall the name, but started with a Z. Once I got that NF addon installed easily.
Went through and adjusted all the various settings to get 7.1 raw output fired up NF, wow cludgy interface, best option is to load what ever I want to watch into my watch list, Then played something and got a small square image, not anywhere near UHD. After more digging I found an option to adjust the video to the correct format, same with audio. So after much time I got there, might have been easier to go out and buy a Sheild, but not worth it.
One thing I did find is that no need to jump through hoops to get DV, once it loads it's there, no backing out and in again as posted here a while ago. Atmos pops in quickly and all in all it works.