Well, you should get it to work if you don't over complicate things.
You'll need to use IKEv1 for the exchange and only policy based VPNs are supported. The Meraki side will need to be configured as Hub. You cannot have traffic going through a non-meraki VPN and then through Auto-VPN. Each Meraki peer needs a direct non-meraki VPN connection to each remote peer.
Try to use as few traffic selectors as possible. Rather use a supernet than use individual subnets if you can. Because there sometimes are issues where a tunnel is basically up but one of the Child-SA's is not and you have to bounce the entire tunnel to get them all back.