If you have 4 mains coming into your panel, your best option would be skipping mains' monitoring completely. As long as you can cover all the circuits with 50A CT's, you're going to have total usage and accurate measurements. The reason I say that is because the monitor has only 3 top ports for monitoring mains.
There's also another solution that would be adding an Utility Connect if you are in a region that supports Zigbee (it’s another monitor we sell, that has to be provisioned by the Utility Company to read consumption from your net meter) and make it your mains, and nest the Gen 2 under the Utility Connect, but for that, you'd need to buy an Utility Connect and have it provisioned by the utility, what can take a while.
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This knowledge base is pretty new for the Emporia team. Our goal is to provide all of the information we can to help you manage your energy in better ways. If this article wasn't helpful, or we could be more clarifying on any points please reach out to the Customer Support team and we'll certainly work to improve these guides.