How do I set up a streaming network with 2 chromebox's and 4 displays?

the situation is this, I have 4 t.v. displays, each with a chromestick. they all use the same wifi network. I have one chromebox in the server room that casts to 2 displays using google cast extentions. what I need to accomplish now is to cast the remaining 2 on my other chromebox... however, the 2nd chromebox cannot see any of the displays, while the first chromebox can see all 4. I've tried every order of resseting and installing to get each chromebox to see only 2 but its either one chromebox see's all 4 and the other see's none. how do I fix this? the only possible soultion I havent tried is to have 2 displays and the respective chromebox on a different network.
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According to Google they have released  Chromecast Ethernet Adapter To End Connection Woes
Have you mirrored what you see on the other two TV  with the Google Chromecast Media Player
If it helps
Do You Need a Streaming Media Player For Each TV?
 here's a Youtube Video Wireless Streaming To TV
With Google Chromecast Media Player

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