I think I would tackle this a different way, using a failover pair of MX450s. I know I would like redundancy for a solution that supports 1200 users. Note that you don't have to buy a licence for the second MX450 when it is used as a warm spare. Plug the two main circuits into the primary MX. Plug the third circuit into the standby MX. The third circuit will only be used if the two primary circuits have both failed or if the primary MX has failed. Note that only the MX450 and above can handle 1,000,000 sessions (search for the word sessions in this document). https://documentation.meraki.com/MX/MX_Sizing_Information/MX_Sizing_Principles
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