You will need to run things at 220 to get the proper power out of the PSUs. These machines pull 1200w each so you will need to upgrade your electrical if you are running them at home. You are looking at 10k watts in total which is a lot of power to run in a home. Also you will need some major cooling if you are planning on keeping these in one bedroom.
Also remember its not about the number of plugs in the room its about the number of circuits. Most houses have multiple outlets off of the same breaker so you need to plan accordingly.
I'd also be concerned about the quality of the power and also your ability to cool these devices properly.
Honestly with that much of an investment I'd consider going with a co-location.. JUST to protect the investment.. also if the technical aspect of environmentals isn't in your wheel house it might be the best overall for up time and reliability.
IMHO