Resolved by thetechguru!
First question and problem: I think the intent is to be able to connect up to 5 EZB's through ARC. However I've hit a wall trying to connect ARC to two V4 EZB's when they are in AP (Access Point) mode. Using my laptop I've followed directions and connected ARC to the first V4 after establishing a wireless connection through the "Wireless Network Connection" icon on my Win 7 Taskbar. Then when I try to connect wirelessly to the second V4 EZB I lose the wireless connection to the first. My laptop will only let me have more then one wireless connection at a time. What am I missing here?
Second question and problem: With both V4's in Client mode and the Green light blinking (the voice says she's attached to my network), I can only have one EZB powered up at a time and have a successful search of my router for a IP address. If both are powered up and attached to the network ARC cant find an address. Is this normal? I've watched the tutorial several times.
Third Problem: For two nights now after the laptop and robot are powered down the second EZB entry in ARC will not connect to the second EZB board. I have to push the network reset button on EZB and redo the IP search in client mode.
I personally like a separate access point on my network and let the cable modem just be a cable modem. I have used Engenius access points with a lot of success. Something like this would go great and could be mounted like a fire detector in the middle area of your house giving you great wifi throughout. It is PoE so you can run one cable and be done. You just need to pickup a power injector to go with it if it doesn't come with one.
Engenius AP
I've got my new network set up as @d.cochran suggests with the Engenius access point he points to and a ASUS RT-AC66U Dual-Band Wireless-AC1750 Gigabit Router. Works real sweet and I have plenty of signal near the robot. This set up and static IP addresses for the EZB's in the router took care of all my connection problems.