Definitely unplug the Joeys. Safest way is to unplug them from the electric outlet and do not plug them back in until the Hopper is 100% complete and up and running.
As for the Hoppers, do them at the same time or do them separate - makes no difference, I'd think. They are "independent" devices at least in terms of s/w updating.
As for the Hoppers, do them at the same time or do them separate - makes no difference, I'd think. They are "independent" devices at least in terms of s/w updating.