How to present public IP on the interface inside VM

I am trying to test AlwaysON VPN with Windows 10 clients

https://docs.microsoft.co.../deploy/vpn-deploy-ras

Any idea how I could present public IP on the interface inside VM, without any NAT done by FTG

(would I need a dedicated NIC in Hyper-V host, or I could do own VLANs from Hyper-V via core switches to Fortigate)

Seb