Our son recently owned a house that had the mandated system where any sort of "issue' with any unit sent them all shrieking.
In theory this sounds like a good idea: in practice it was awful!
Because any problem in a single unit set them all ablast, it was very difficult to determine which detector was the culprit.
In both our home and VR we use inexpensive smoke detectors and independent CO detectors. We replace batteries and detectors as needed.
Steve