Important Clarification as I have not revisited this thread for a bit.
Since the HD500X factory wall wart adapter has a higher amp rating in order to provide the HD500X with its required power, the factory supplied HD500X wall wart is what I am using to power via the 5 plug daisy chain. The HD500X is first in line to receive power, then the other units, all of which have been confirmed by True Tone to bear the tolerances necessary to protect them from any potential overpowering.
I am NOT using ONE SPOT's wall wart, but I am using their 5 plug daisy chain.
FlyingSquirrel's post in Anybody using any ONE SPOT products with their HD500X? was marked as the answer