I think you are referring to "standard" security appliance clients. If so, you apply the group policy "Allow". This is based on the MAC address. https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Blocking_and_Allowing_Clients#Allow_List
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No, it's not possible, unless you have an MX, in this case you can enable splash page on a specific VLAN. https://documentation.meraki.com/General_Administration/Cross-Platform_Content/Splash_Page#MX_Splash_Page_Options
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