Anyone have recommendations (tested/practical is best :-)?

The APC Protectnet PNET1 and PRM24 seem quite nice and not too expensive -- if they work....pros? cons?

It sounds like you're either out of NEC, or, you are grounding them to waterpipe. I believe NEC calls for grounding via earth. You could strike some rod into the ground several feet deep, attach to the pipe with conductive screw+locknut+washer, and a proper gauge for distance cable. Theoretically, that should solve your problem. What did you electricians say? -M<