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Here is how to do it.

Put a high quality gigabit managed switch in your rack.
Plug the ilive into the switch.
Plug dante into the switch.

Put a gigabit switch at the other end and plug your surface into it.
Then plug your Mac into it as well.

This will give you a single cable solution with no redundancy.

If you buy decent switches that support spanning tree protocol then you can run as many cables to FOH house as you like and if one fails the whole thing keeps going.