OpenVPN Client to Instance migartion

[wewall]

I want to migrate my OpenVPN Client configuration from legacy to the to the new Instances. But some Settings in the New Configuration are not clear, and I hope someone can point me in the right direction.

I have two WAN interfaces: wan1 and wan2.
I have two OpenVPN instances: opt1, opt2.
I would like to route opt1 only via wan1 and opt2 only via wan2.
Wan1 has a static IP and wan2 has a dynamic IP.

With the legacy OpenVPN Client configuration I can easily set up everything because I can select a specific interface in the Client settings.
In contrast, in the new OpenVPN Insatnces settings it is possible to assign only a Bind address.

In case of opt1 (routed via only wan1) should I set the static public IP address of wan1 as Bind address? And that's all?

In case of opt2 (routed via only wan2 with dynamic IP)  what address should I set as Bind address?
(If I set the current IP address of wan2 as Bind address it seems to work, but what if the IP changes?!? Should I manually set a new address each time?!?)

[AlexS]

Note 1: Leave empty to bind to all addresses assigned to this machine or use a loopback address combined with a port forward when the external address is not static. (found here: https://docs.opnsense.org/manual/how-tos/sslvpn_instance_roadwarrior.html )