Helo @Lara-and-Stefan0
If I was you, I would write my message on the spanish speaking community, since they will have more updated information on how the recent taxpayer system works. -> https://community.withairbnb.com/t5/Todos-los-foros-de-discusi%C3%B3n/ct-p/hospedar
To check the taxpayer information go to "Preferencias de Cobro" and scroll down to "Añadir contribuyente español".
I don't think it would be possible to split the Airbnb income on diferent taxpayers since the new "modelo 174" ask for one taxpayer only. There workaround I could think of was that the one taxpayer set on Airbnb shares the income with the others by a contract that is also reflected on their taxes (declaración de la renta).
However, the most reasonable solution to avoid any issues with IRS/Hacienda would be to set up a "Comunidad de Bienes" or a "Sociedad Limitada" and make the company be the taxpayer and then share the profits on the different persons you mentioned.
Best regards.