Smoke detectors (wired/wireless) - how much is enough
This might explain why you have many in the same area especially if in the sleeping area of the house.

https://www.nfpa.org › Public-Education › Staying-safe › Safety-equipment
Install smoke alarms inside each bedroom, outside each sleeping area and on every level of the home, including the basement. On levels without bedrooms, install alarms in the living room (or den or family room) or near the stairway to the upper level, or in both locations.

Some of the "extra" ones you think you have might be carbon monoxide detectors. I'd think twice about removing any safety devices.