Usually those sort of lists from vendors, especially a cloud vendor are just URLs/IPs you need to bypass in your content filtering solution and perhaps allow outbound in your firewall rules. Meraki, like most firewalls, is stateful, if you initiate an outbound connection somewhere, inbound traffic for that connection will work. Unless a vendor needs to actually access some sort of device on site via NAT, there usually isn't a need for a specific inbound NAT/rule. Generally I recommend doing the outbound rules if your environment needs them and testing to see if things works. Most of the time they will.
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