@Darian, not sure about iPSK as a solution to this, but you could use Layer 2 isolation on the VLAN to prevent clients ‘talking’ to each other. With Layer 2 isolation (SSID needs to be in bridge mode) clients have to communicate through the default gateway. See https://documentation.meraki.com/MR/Firewall_and_Traffic_Shaping/Wireless_Client_Isolation.
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