Thank you for posting and welcome to the Bose Community. Sorry to hear that you have some issues finding mounting information online.
You can find all you need to know in the owner's manual on page 11 here.
If you have any other questions, please do let us know.
We look forward to seeing you around the community 😊.
If you are looking for a bracket, I would recommend reaching out to your local support team for the best advice.
You can do this by clicking the LINK HERE, selecting your country and scrolling down to 'Contact Us'. One of the team will be more than happy to help you.
If there is anything else we can do, let me know!
I'm sorry to hear that you feel like you have received no helpful advice.
The information you are looking for is region-specific. Therefore, for the most accurate advice, you will need to get in contact with the technical support team using the details linked in my previous message. The team there will be more than happy to help you where they can!
If there is anything else I can do, please reach out again.