We are interested in deploying Meraki SD-WAN with AWS Transit Gateway architecture, I found the detailed documentation on Viptella integration with AWS TGW but not able to find anything on Meraki integration.
Has anyone successfully deployed Meraki with AWS Transit GW architecture?
You can refer to my guide for deploying a pair of VMX in HA mode, and in your case, the VMX go into the transit VPC. However you have to use static routing to the VMX, and from the VMX to the transit gateway peers.
On the Meraki side you would use tag based failover to build the VPNs to the CSRs. You would put the MX's into a separate network from the rest of the AutoVPN infrastructure, and create static routes between the two. Or you could simply use a pair of ISR1111-8P routers with a security licence instead.