Want to make a Chia farm of 156 external hard drives
Your calculations are correct.  In reality it’s likely that the drives will draw rather less than the 36W each, but it’s wise to allow for the maximum.  Check the current rating for your whole house - 5.6kW is a significant amount.  You’ll also need to consider how to get rid of the waste heat, don’t just stack up dozens of drives.  As you say, you’d need to use multiple AC outlets, and it’s up to you how you want to fan those out and where to do the AC-DC conversion.  It is certainly possible to get 12V supplies with significant power capability; perhaps check out PC power supplies, or those intended for amateur radio.  Don’t under-estimate the size of cables you’ll need to carry 20-40A with acceptable losses.