Happy to try and assist - while the Z3 is out of stock until May timeframe, the MX64 is very similar to the Z3. It has a clearly labeled WAN interface, that will pull DHCP from the ISP. It has all the same functionality with VPN, VLANs, with additional security features with the Advanced Security License (not available on the Z Series). You can utilize a PoE injector or power adapters to support PoE devices (or see if MX65 appliances are available).
Here is additional documentation to get it setup: https://documentation.meraki.com/MX/Installation_Guides/MX64_Installation_Guide https://documentation.meraki.com/MX/Site-to-site_VPN/Meraki_Auto_VPN#Auto_VPN_Configuration
[Mod note: Marking this as solution for greater visibility / ease of scanning this thread]
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