Do you have any inbound NATing to internal servers or client VPN users, or non-Meraki site to site VPNs? If so then the setup is designed to give you circuit failover and for everything to continue working the same. You could make the setup slightly nicer by getting an additional MS120-8P switch, putting it into a separate network, and using that for all external communications. If not, you could simplify this to connecting it as you have mentioned, and using two "ordinary" Internet circuits and letting the MX handle the failover.
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