I think the most important thing than the model is the definition of a good design. Generally an HDX environment brings some challenges.
If you don't have experience with the topic, the ideal is to hire a specialized company.
https://documentation.meraki.com/Architectures_and_Best_Practices/Cisco_Meraki_Best_Practice_Design/...
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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