Hi,
I don't understand your question very well.... My advice would be:
-Leave the moogs in their boxes, since they take up a lot of space and power in the rack.
-Use the power supply of the rack for the modules that you buy.
-A rack can have different sources and feed different modules, by rows, for example. Imagine a 12U rack with two PSUs, one for each 6U rows.
Best regards,