Yes, I am thinking I might be the only other person on here with a Nexus 9 (since they only sold 13 of them...). I will state however that my test flights with my nexus 9 where fairly unsuccessful even with OTG...
Nexus 9 works. You'll need an adaptor to mount it.
OTG is bit funky, hit or miss. On my 3ed cable it was stable.
Big issue is the crashes of the Got app. Memory hog and it stalled a few times.
The usuall Android issue with DJI.
Nexus 9 needs more horsepower or the App needs a serious update. Did a full wipe and clean install to Android 7.1.2 , still not stable enough to trust.
Would not recommend.