I've checked on a USB meter and it's taking 1.5A per Moonlander.
So a 5A hub should be fine for 3 landers....
I'm testing with only 2 in the hub, and have had 1 dropout so far.
1.5A at 600mhz?
Which Anker hub? I have this one, and it won't reliably power 3 of them at high speed, but 2 only are rock solid even at 954mhz.
https://www.amazon.com/Anker-PowerIQ-Charging-Macbook-Surface/dp/B00VDVCQ84It should draw 1A @648MHz perfectly tuned.