Hi gpepe (@gpepe). Thank you very much for your question.
You will not have any problems in terms of SEO.
In the back-end, you see the mobile versions, but these pages are private. When you save a mobile version page, the plugin automatically gives the private status. This prevents SEO plugins or external tools creating sitemaps including the mobile version pages. Not logged-in users and crawlers will never see the mobile version URLs.
Without modifying directly in the database or writing custom code, it’s impossible for the user saving the mobile version with the normal public status. Even if you write custom code to do it, the plugin will warn you about the risk if it detects public mobile versions.
When the page is loaded on a mobile device, the plugin just replaces the desktop content with the mobile content before to send the HTML to the browser. You have no redirections and no duplicated public content.
Crawlers will not know that the mobile version URLs exist.
The same URL will give the desktop content on desktop devices and the mobile content on mobile devices.
