All water hammer Q's/A's relate to a hard bang noise
when water is turned off (suddenly).

My noise hammers continuously while the water is running
at a range of flows, from several faucets (sinks, toilets
etc. Seems to do it on cold supply only.

Is there a single arrester that can be installed in a
single place in the system. I would rather not try to
install one at each faucet location.