Meraki gear is cloud-managed and doesn't expose local SNMP by default the way on-prem switches do. The Meraki dashboard API is the path Linivo uses instead.
Under Organization > Settings > Dashboard API access in the Meraki dashboard, enable API access; it's off by default at the organization level.
Under your user profile, generate an API key scoped to your account's organization access. Treat it like a credential, since it can read (and depending on scope, change) your entire Meraki estate.
Rather than adding devices one at a time, Linivo's Meraki integration polls the dashboard API for the whole organization and creates a device per switch, AP and security appliance it finds, refreshing as devices are added or removed.