my deployment info as below,
3 units of IAP and each unit IAP broadcast Employee and Guest SSID;
Vlan 1 ( management Vlan ) 192.168.1.2 ; 192.168.1.3 ; 192.168.1.4
Vlan 2 ( Employee Vlan )
Vlan 3 ( Guest Vlan )
Virtual IP 192.168.1.2 ( same as one of the management vlan IP )