Make a transit vlan/ subnet between the two devices. Then create all static routes with tracking with next hop the other mx ip https://documentation.meraki.com/MX/Networks_and_Routing/MX_Routing_Behavior#Static_Route_Tracking This describes it better but instead of mpls you use the fiber https://documentation.meraki.com/MX/Deployment_Guides/MPLS_Failover_to_Meraki_Auto_VPN
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