Hey Stew!
All Meraki switches support LACP groups of up to 8 ports, and as cmr said you can do so between physically stacked switches.
Further documentation on our implementation of LACP can be found here:
https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Switch_Ports#Link_Aggregation
Let us know if you have any other questions! 🙂
-Donovan
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