Look at that magnificent beast.
It works like repeatedly filtering vodka: Each UPS draws power from the one beneath it, magnifying the power-conditioning effect exponentially. By the time your electrons reach the hard drive at the top, they'll be some of the purest and safest electricity in existence.
While this method is great for ensuring the physical safety of your data, if you care about uptime you'll need to have at least two of these badboys for redundancy.
Do it. You'll attract the envy of your friends and the smouldering desire of women everywhere.