There's really no way to do this with the Meraki gear. Users will always be able to lookup their public IP address by going to a page like Instant IP Address Lookup (whatismyipaddress.com) The only options that come to mind are: Tunnel all traffic to a SaaS gateway/VPN (Cisco Umbrella, ZScaler, Cloudflare etc.) so that their public IP is what will show, not your one. ISP configured CG-NAT, in which your outbound IP address will actually be a private IP NAT'd to the ISP's public IP. That being said, I don't think either of these options are justifiable for that specific purpose alone.
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