you do not HAVE to have it plugged into a laptop, if you export your tracks to a usb device and plug them in to the 900's, you will be good to go, Just make sure quantizing is enabled when the tracks are being analyzed
I personally use a 5 port Cisco/Linksys switch, (Cisco-Linksys EZXS55W EtherFast 10/100 5-Port Workgroup Switch), It was not that expensive, maybe like $30 and it works great, I know Netgear makes a great one too so I guess look at the prices and see what you want to spend