Hey Vincent, you'll be prompt in the interactive mode of installer to specify a network interface. Or you can specify it via parameter in the silent mode.
--cluster-ip — If your machine has more than one network
interface you need to decide which network interface will be used for
Dynatrace Cluster traffic and put its IP4 address here.
In case you want to configure more details on IP addresses used specifically for UI and agents it's only available in UI - Node details page. See the screenshot:
Does it answer your question?