Best in wall sound and ethernet wiring installation?

I recently purchased a house with an in-ceiling, multi-room sound system that isn’t working correctly. I’m looking for a company experienced in diagnosing and fixing these kinds of systems. Any recommendations would be greatly appreciated!

Additionally, I’m planning to install POE cameras and need a company that can run Cat 7 cabling in my older home. If you know of a reliable team that handles this type of work, I’d love to hear about it.

Thanks for all your help!