Appian Service-Manager and Data-Server containers hostnames

Hi all. I am busy getting Appian running on Docker using this guide: docs.appian.com/.../Installing_Appian_in_Docker_Containers.html

There is a section in the docker-compose.yml file where I need to specify the hostnames for the service-manager and data-server containers.

I would like to find out if the hostnames for the two containers should be different or can they be the same for both containers?

Then I assume that the two hostnames should be created in our DNS to point to the public IP address of the server that will run the Docker containers, is this correct?

Thank you,

Morné