okay  the top one can be found for 50 bucks I have 2 of them

you can certainly do 3 s-9's  and in the winter with colder rooms maybe 4

I will give you a link for cheaper price on them

https://www.ebay.com/itm/Genuine-HP-EO4501-Server-Power-Distribution-Module-228481-002-Two-Extension-Bar/122800749398?https://www.ebay.com/itm/Hewlett-Packard-HP-EO4501-Power-Distribution-Modular-PDU-Control-Unit-228481-002-/263163099707?

more info

https://bitcointalk.org/index.php?topic=2192299.msg22020934#msg22020934


as for running 4  vs 3

3 is easy peasy 4 is iffy

I don't know  your power volts  you could be 218 to 242  volts on a full draw

and you can't tell until you hook up the gear.

and if you are in a commercial spot  you could be 208 volts

these are 30 amp pdus  de rated to 24 amps for safety   so you get  6 amps an s-9

6 x 208 = 1248 watts which won't work
6 x 242 = 1452 watts   which  may work

s-9's  sold the last 3 months  were 13.5 th and 14.0 th

If you grabbed 13.5th  they pull less power

and within the 13.5th group some are better then others

so 4 per  pdu on a 30 amp circuit is maybe
I can do it in the winter but in the summer  warmer weather I can not.

I run 237 to 242 volts  on full draw


found another one

https://www.ebay.com/itm/HP-Powerware-Dual-PDU-Rackmount-Assy-24A-8-outlet/172997481559?


this is also good

 https://www.ebay.com/itm/APC-AP9570-Rack-PDU-Basic-1U-30A-208V-Surge-Protector/263341497055?

that is 5 so far  which will do 15 to 20 s-9's  all cheaper then what you  linked

more

https://www.ebay.com/itm/APC-208VAC-24A-50-60HZ-10-OUTLET-1U-BASIC-RACK-POWER-DISTRIBUTION-UNIT-AP9571A/253248986252?



I also have links for psu's
and for power cords