You probably want to get a system installed that is made for commercial spaces. Most equipment for home listening probably isn't really suitable. I know of cafes that have a proper stereo set up, but in a space like a restaurant I don't think you are really going to be picking up on all the nuances a good stereo can provide.
You might get lucky, but I don't think this is really the place to come for expertise on pa systems for those kinds of spaces.
I know Bose and Yamaha do installations for various uses. No idea about other brands.
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