Just so I'm asking correctly, We are basically wanting to configure the environment like the second example in this Meraki document https://documentation.meraki.com/MX/Networks_and_Routing/Passthrough_Mode_on_the_MX_Security_Appliance_and_Z-series_Teleworker_Gateway Except, instead of going out to the Internet, we will be going into our Vendor's router and have a second MX as a spare. I assume one of Internet ports on the MX will be used for the Vendor router and the other will go into our LAN, which will have access to the Internet.
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