Why use VRRP if you're already stacking? In a warm spare MS configuration, VRRP will be leveraged to exchange heartbeats and determine if the warm spare should take over when the primary fails. But if you just create a physical stack, and stagger your devices (especially any dual-homed devices) across multiple switches in a physical stack, that tends to meet the majority of use-cases. You can also do cross-stack LACP so if you're uplinking/downlinking to other switches or switch stacks, that works too. Double check this doc https://documentation.meraki.com/MS/Layer_3_Switching/MS_Warm_Spare_(VRRP)_Overview to see if it's really what your requirements dictate as opposed to physical stacking, and let us know if something's not clear.
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