By RMA only, are you referring to the Meraki Now support options (part numbers starting, CON-)? If so, then these are only for support once deployed, not for deployment.
With the relative simplicity of the Meraki kit and that it’s cloud managed you can usually talk someone through installing the kit and connecting it. It’s pretty much plug and play if done correctly, maybe the only pre-staging needed is on the MX where a PPPoE username and password (or static IP configuration) might be needed if your provider uses them.