If you have one security appliance you can set up a VPN tunnel with an MR33. https://meraki.cisco.com/lib/pdf/meraki_datasheet_MR33.pdf https://documentation.meraki.com/zGeneral_Administration/Cross-Platform_Content/Client_Addressing_and_Bridging/Small_Remote_or_Home_Office_VPN_Options Doing this all your locations will be connected and would not require a MX at each location.. your "Corporate" traffic could be tunneled back to your MX and your guest traffic will be just sent straight to the internet. I can dive more into this if this is something you are looking for.
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