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There are no modules officially supported on Meraki's SFP page, but I have some 10GTek 10GBase-BIDI links operating successfully. This is SMF though, not sure if they also offer MMF solutions.
The MX's need different IPs so each of them can communicate with the cloud. If you have a third IP address available, the MX's can share a Virtual IP (VIP) so then network's public IP (and incoming connections) don't change in a failover situation.I...