Group Policies
It is possible to manually apply group policies to clients connected via client VPN. A group policy applied to a client VPN user is associated with the username and not the device. Different devices that connect to client VPN with the same username will receive the same group policy. For more help on assigning or removing group policies applied to a client, refer to the Creating and Applying Group Policies document.
It is not possible to assign group policies automatically once a user connects to client VPN.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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