Where to install a water conditioner?
I think you should reconsider reliance on unproven technology (magnetic water conditioning). There is a "lack of peer-reviewed laboratory data, mechanistic explanations, and documented field studies to support its effectiveness" 

and "an internal study in 1996 at Lawrence Livermore National Laboratory found no difference in preferred crystal structure of scale deposited in magnetic water treatment systems", disproving hypotheses of proponents of the technology.