Powercon is good for up to 250 volts. You could feed your chain of 6 Mac101 with either 120 or 208 without a problem. And 10 gauge wire is way overkill for that application, 14/3 cord is rated for 18 amps, 12/3 cord is rated for 25 amps.
Where are you going to get a 25A circuit?12/3 at 25amps at 208v.
I'm a big fan of higher voltages due to conductor resistance. Less % voltage drop.
Where are you going to get a 25A circuit?
We routinely do 8 mac101's on a single 120v 20a circuit with no issues. 12/3 cable. You could probably put a couple more on the line with no problems if you needed to.