Nope, SSL is required to keep user data secure, verify ownership of the website, prevent attackers from creating a fake version of the site, and convey trust to users. The chain of trust of a certificate chain is an ordered list of certificates, containing an end-user signer certificate and intermediate certificates (which represent the intermediate CA), which allows the recipient to verify that the sender and all intermediate certificates are trusted.
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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