On the ones I'm using now I just mount it to a screw on the neptune apex classic. I checked with a multimeter that it is grounded.
Some (like the one posted above) just plug into a socket and it only has the plug on the ground side of the outlet.
Although one thing not really mentioned is you have to ensure your ground is working properly. Something like either of these would work so you know the ground is actually grounded:
https://www.harborfreight.com/electrical-receptacle-tester-with-gfci-diagnosis-63929.html
https://www.homedepot.com/p/Power-G...wxG0_Na57IIKDXHgadAaAm2DEALw_wcB&gclsrc=aw.ds
