I think the most valuable insights to get is where the placement of the Grid Protector provides the best performance. So for example being it just next to the wall socket of where the power-strip / power conditioner is running from (as many have a double socket and have one left anyway) or at a wall socket that is somewhat apart from the rack having a different input on the power line. But it will also have a different effect on all hifi components as it's located more distant away (most of the time a few meters) so will have a different effect on the devices.