Ok, here is the quick and dirty of how I set up my electrical. If you look at the 4 plugs currently connected to the EB 8, they are pigtails that go to the GFCI outlets. Outlets 1 and 2 go to my heaters (top 2 outlets), 3 goes to my sump return pump, and 4 will go to my skimmer. The VorTech MP40's (I have 2, but one wouldn't reach) will not be plugged into the EB 8.
Heater 1 is set to maintain 77 degrees. The Apex will not turn the outlet on unless the temperature is below 77F and turns it off at 79F.
Heater 2 is set to maintain 74 degrees. The Apex will not turn the outlet on unless the temperature is below 75F and turns it off at 79F.
By doing it this way I have a separate GFCI for each electrical component that is submerged in my sump. A single ground fault will not take out more than the one failed device. Long term I plan on plugging in an indicator light visible outside my stand to quickly indicate if I have a tripped GFCI. And yes, I do have a ground probe installed in my sump.
Since my lights and powerheads are not in the water I have decided not to put those in a GFCI. The powerheads will eventually be powered from a battery backup system that will keep them running for at least 5 hrs if I have a power outage.
I feel like this is a great compromise in tank/fish safety as well as being extremely safe for people.