Azir and Positioning

I love playing azir, but have no idea how to position myself (not the soldiers me). I want to be close enough that I can effectively use my q to position my soldiers behind the enemy so I can knock up with e and get as many autos in as I can. The only problem is that if I'm too close and someone stuns me, knocks me up, etc I am not tanky enough to usually get out (especially if the enemy champ is standing inside of me so me e just hit them). The last game I played was a good example of this. I went duo morello into zhonyas so I did plenty of damage, but if the enemy jax jumped on me and my ult wasn't up I would come close to death if not actually die. All their kat needed to do was jump on me and all their vayne needed to do was ult and get in range and I was screwed.

So in teamfights and in 1v1s how should I try to position myself to keep myself from getting destroyed?