You can indeed use configuration templates to manage multiple networks in your organization. But, there are some limitations when using templates with AutoVPN hubs, it is not possible to configure an MX as a spoke with an exit hub that is part of a template. This means that AutoVPN hubs should not be added to templates at all.
As for CISCO TAC, they will not remove/move devices on behalf of an organization administrator for security reasons.
Managing Multiple Networks with Configuration Templates - Cisco Meraki Documentation
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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