I’m not too sure on how good the Eucon integration with Nuendo is.
Back in the days that EuCon was written by Euphonix, Nuendo was the application for which it was tailor made. And; the Euphonix MC Pro Buy Pro Tools | Immersive Audio | Dolby Atmos Studio Design is a 100% match. I can say that from my own experience.
If you’re on the search for a serious controller, I think the MC Pro is the best you can get, but: it’s old, so you won’t be able to use it without issues. 
Does anyone have any other recommendations or comments on the Eucon integration?
Just ask me/us your questions and I’ll be happy to answer them.
Niek/ Amsterdam.