You don't configure VRRP explicity.  You just setup a "warm spare" and it does it automatically. https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair   I'm somewhat confused by your statement saying this is both for a new site and you want HA (meaning they are usually at the same site).   If they are both going to be layer 2 adjacent then you need to plug their WAN interfaces into the same ISP circuit.  Perhaps the ISP provides a device with multiple Ethernet ports to do this - otherwise you are going to need to do this yourself using your own switch.   If you are not doing warm spare then I would plug the ISP circuit directly into the MX and keep life simple. ... View more