I have a Titanium Probe with directions that tell me to attach the eyelet to a known ground. They suggest the center screw on an outlet. My outlet is not accessable to do this with (behind the tank and I can only barely get at the GFCI switch if needed). Can I attach the eyelet to any screw? Maybe the screws holding my fans into the canopy. I am totally electronically challenged. It seems that a "known ground" would be more specific than the screws that hold my fans in place. I need some help here. I don't know where to attach the eyelet. And can someone explain exactly what this probe does. I know it is important and collects stray voltage, then what?