Not using VLAN 1 is pretty much the only suggestion since there is no VTP on Meraki so not to much benifit to staying inside standard VLAN range. But any VLAN you want to reach other side of MX you will need to configure in MX. Any switch you want to have ability to use VLAN will need VLAN configured. Layer3 switches you will also want to configure an interface so they can route packets between VLANS. Be sure not to reassign interface IPs when doing this.
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