It's working but is there a better way to hook it up? Also Audacity is only recording 1 player?

DJM 900 Nexus and (TWO) CDJ 900 Nexus

First I have them hooked up to an 8 way Netgear split. Is there a better way or is this the only way. (I'm still a little lost on the ONE Eithernet port on the DJM and what exactly it's for or how to use it.

The current configuration works but as I said, do I need the split and if not what's the best way to hook it up. 

AUDACITY: Love DJ Pulses how to videos. I was able to figure it all out except that player one records music on Audacity however player 2 does not. So back to my first question, did I hook it up wrong or is this something I overlooked in settings either Pioneer or Audacity. 

I'm using digital coax.