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For expansion tanks you can do either. Whichever is more convenient but if you decide to go with 1 tank it must be sized for the combined storage capacity of both tanks. It really doesn't matter where you put the tanks since the pressure will equalize throughout all the piping in the house. Re: the PRV; if the pressure doesn't drop after you adjust the PRV and then draw some water to alleviate the excess pressure then you need a new PRV. You need to measure static pressure (no water running).