I ended up the
USB 2.0 7-port hub from Plugable. Same as the USB 3.0 but $10 cheaper. You don't need USB 3.0 as the external power is same on the USB 2.0 versions.
what about short USB extender cables?
You can try, but sounds like three Moonlander2 will work best. I was planning in using 4 Moonlander2 with this, but worried about Port 5,6,7 as two Moonlander2 will share one regular. Not sure if there will be enough watts for port 5, 6, 7.
https://bitcointalk.org/index.php?topic=1779423.msg17921042#msg17921042As I discovered with my 7-port, 60W charging hub from Plugable -- pop it open and look at how the power is distributed.
On the Plugable, it takes 12vdc in and has 3 buck regulators taking that down to 5v for the USB plugs. That said... 1 regulator feeds ports 1 & 2, the 2nd regulator feeds ports 3 & 4, the 3rd feeds ports 5-7. See where this is going?
After futzing around with 2x of the 2PAC's along with an original Compac just plugging them in 1-2-3 I was unable to run all 3 at decent speed without at least 1 stick dropping out. Looked inside the hub and found ^^ so...
Put one 2PAC on port-2, the other on port-4 and the Compac on port-6 so each stick has it's own 5v regulator.