Hey Eric!
Dashboard Networks are containers for device configurations, so the only way to set up an MX config would be to create the network where that config (and eventual MX) will be located. However, Meraki hardware does not need to be added to the network in order to set up your configuration, so you can pre-stage your entire network configuration without claiming or adding an MX serial into the network. If you want the MX to download and run that config, its hardware serial must be claimed into the network, the device powered up, and then allowed to communicate with the Meraki cloud, at which point it will auto-configure itself based on the network it's been claimed to and the configuration in that network.
Let me know if you have any other questions!
-Donovan
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