Hi @Jean174, Thank you so much for sharing your question with us!
Have you managed to get some information on this? I wanted to share an Airbnb help article that may help a bit to navigate through this question: https://www.airbnb.ca/help/article/1864.
I will also reach out to our kindest and most experienced host member @Joelle43 if she has some tips and insights on your question! I hope she helps us get more ideas about syncing calendars!
I'm not going to be much help to you I'm afraid as I have no experience on using multiple platforms as I am only listed on Airbnb. However there is one thing to bear in mind - the Airbnb calendar is only updated every 3 hours so this could leave you wide open to receiving double bookings from your other STR platforms during that time frame.