I have one account with two listings - one in the UK and one in Portugal.
I pay tax on the income from each listing to the relevant country but my Portuguese accountant has now told me I need a MOD21 RFI from Airbnb to prevent me from being double taxed.
What beautiful properties you have, it must be really interesting to host in two different countries! Regarding this tax query, did you get a chance to contact the Support teams by any chance? They might be able to guide you further - here's how you can get in touch. 🙂