IC2 will allow you to remotely log into each device using Remote Web Admin.
This will allow you to have access to each device and you will not have to setup DDNS for each device.
As for configuring Captive Portal from IC2, a guide can be found here. Please remember to add the captive portal the the VLAN only if a Peplink\Pepwave router is being used. If you are using only a Peplink Access Point you will want to add the portal to the SSID.