Likely you will need two PSU's - 12 GPUs will need a lot of power. And then some.
You must be aware of what all is involved and required - including wattage calculations and cooling requirements.
For the most part there are options, trade-offs, and risks with the mining rig you have in mind.
Google "PSUs for mining rigs". Filter the results to the last year or so.
I found quite a number of links that should prove helpful.
For example (not a recommendation or endorsement):
https://www.windowscentral.com/best-power-supplies-mining
Granted not a direct answer to your post. However, you are planning a very expensive mining rig and the real ROI (Return on Investment) is likely to be very low.
No room for costly mistakes.
Do some searches, learn, revise your searches accordingly. Be critical of what you read and double check everything.
Just my thoughts on the matter.