1. can ZS work in Bridge Mode as QoS Traffic Shapper and Captive Portal in same time?
Yes, it can. Traffic shaper and Captive Portal modules are indipendents.
2. is config with 3 NIC possible and behind router possible?
Yes, it is possible.
3. if computers are connected to ACCESS POINT by wireless router with APC mode (WISP) can it make some problem for Captive Portal?
Please post me more details. I don’t know what APC mode means.