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.