Hi,
I´ll be connecting 20 S9s, and I´ve been looking a these PDUs:

https://www.ebay.com/itm/Do-not-mine-on-110V-5-2kW-Four-Outlet-PDU-for-Antminer-S9-L3-T9-S7-/182469461559

https://www.cyberpowersystems.com/product/pdu/pdu30bhvt8r/

I would like to connect 4 S9 to each PDU, is it ok?

Thanx