Hi @appscaptain thank for reaching out about Domain Mapping System.
We are actually working on the TranslatePress integration as a PRO feature to hopefully be release within 1-2 weeks. In terms of SEO, yes, that is also available in our PRO feature set.
However, this is a forum for the free plugin, where we can only discuss the free functionality of the plugin, so I would kindly request you to please contact us regarding any PRO features at [email protected] moving forward.
I would always suggest configuring the free version of the plugin first and ensuring it works in your server environment with at least one mapping. Not all hosting companies support alias domains. You can review our documentation here for more details:
https://docs.domainmappingsystem.com
Looking forward to hearing from you for any other questions.