Use a dual 6-20p outlet:
https://www.amazon.com/Leviton-5842-I-Receptacle-Commercial-Grounding/dp/B000U3BVMI
Attached to two 6-20p to c13 y splitter cables like this:
https://www.rackmountpdu.com/category/189-6-20p-to-c13-splitter-power-cords.aspx
That will do 4 units for less than the cost of a PDU alone.
https://www.amazon.com/Leviton-5842-I-Receptacle-Commercial-Grounding/dp/B000U3BVMI
Attached to two 6-20p to c13 y splitter cables like this:
https://www.rackmountpdu.com/category/189-6-20p-to-c13-splitter-power-cords.aspx
That will do 4 units for less than the cost of a PDU alone.
Current plan will be the following:
Get a 40A dryer cable and run that to a 3 gang box. Get 3 of these receptacles and build my own box from those, then get cables from the receptacles to the miners.