Hello @Pluto,
Glad to hear that the import was successful! As for your other questions:
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Roon does not support Airplay 2 at the moment and we have not made any announcements regarding Airplay 2. With that said though, you should be able to use the Homepods as standalone zones with Airplay 1 and if you want to use them as stereo pairs, would need an intermediary device making the Airplay 2 connection (system output on a Mac or using an iOS device with Airplay 2 grouping). (See: Apple HomePod Stereo Pair). Please let me know if that works for you.
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Support for portrait mode on iPads has been brought up with the dev team and a ticket for this issue is in their queue (see: Roon not working in portrait mode on iPad Pro [Ticket In])
Hope this helps.
Thanks,
Noris