Skip the Gaming section of the sticky, thats for PCs. Theres no need at this time. Just use the Gamefuel information. And yes, you will need to add a GameFuel rule for each xbox you have connected. PM me if you need to and I'm on XBL too. Hope the sticky helps. IT works well. Will be interesting to see if you can get all 3 boxes on WiFi and all game at the same time. LOL.
GO thru and add the Static IPs one at a time first. Once you have them added, then add the gamefuel rules for each.