DMS Multi-AZ standby replica IP address

Hi, When deploying DMS in a multi-az configuration, I understand the standby replication instance will be in a different AZ and sat in a different subnet.

In the event the standby replication instance is called into action as per the documentation;

"If the primary replication instance fails or becomes unresponsive, the standby resumes any running tasks with minimal interruption"

I am correct in thinking you can specify the standby replication instance IP address from the subnet of the AZ? -

Reason being is I use DMS within private subnets that connect to a client via a site-to-site vpn, so I often have to specify the subnets in use and also the IP addresses of the replication instance. There is no such thing as a floating or shared private IP for the primary and standby replication instances?

Thanks, David