I have no issues with my C9 and over 12 devices hooked up to it. 6 are wired I had to hook a switch up to get more ports but 6 on wifi including PS4 and multiple devices streaming Netflix simultaneously. Of course your internet speed will be a factor, but with my 150 MB/s connection I notice little to no lag.

Yea I'm on rogers and I'm getting 150/15 speeds. The only thing I'm concerned is having Nat issues when more then 1 console is being used at the same time ,

I doubt it. I used to have two boxes running on an old netgear pos router about 10 years ago when I was living with a roommate. We'd both be online playing no issue. I doubt the modern router or in the case the c9 would drop an issue.

But if you can I would hooked them up wired Ethernet to avoid any possible game ruining latency that could occur over busy wifi networks.