ML 350 G5 with 2 PSU - suitable UPS ?

Hello,

This is my first post so please forgive if I make any mistake.

I’d like to apply UPS solution to company server that was last time change to HP ML350 G5 (2 x L5420, 2 x 300GB, 2 x 146GB) with 2 x redundant PSU DPS 800GB.

This is tower version, so I consider only non-rack solution.

Could you give me some hints how to select optimal UPS for this hardware ? Concreate proposal are welcome ;o)

Is it true that UPS should cover more than 2 x max output of particular PSU ? In my case UPS should have at least 2000 W (output power) + true sine wave ?

Thank you,

Andy