You could consider putting a VMX into Amazon AWS or Azure, use AutoVPN to build all your VPNs automatically to there, and then create a single tunnel from AWS/Azure to Umbrella SIG.
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This script is based on the V0 API, which is now deprecated. Check out this back system provided in the sample Meraki automation scripts. https://github.com/meraki/automation-scripts/tree/master/backup_configs
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Are you uing Meraki WiFi? If so you can set a limit for the SSID. https://documentation.meraki.com/MR/Firewall_and_Traffic_Shaping/Traffic_and_Bandwidth_Shaping
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