USG route based vpn

Hi,

I will soon have an old USG110 appliance on hands and I need to create VPN tunnel to another brand fw.
There is lots of subnets behind that firewall so I don't want to create multiple phase2 selectors.

I just read this article:
https://kb.zyxel.com/KB/searchArticle!gwsViewDetail.action?articleOid=015634&lang=EN
Is it possible to create route based vpn without vti ip address?
Or is that vti ip address assignment mandatory?

Thanks in advance.