In case you are thinking of using a Z3 as your firewall, rather than simply a VPN device, you might find it useful to look at the configuration pages to see if it has what you need.
Addressing & VLANs:
Wireless Settings (for built-in wifi in Z3):
DHCP:
Firewall:
VPN:
Client VPN:
Traffic Shaping:
Access Control:
Splash Page:
Throughput:
Z3 throughput is 100Mbps
VPN Throughput is 50Mbps.