server ups apc

Best UPS/APC for 2 Computers/Servers?
Hi, what options/models of UPS to I have to protect 2 servers from at least 30 min of blackout?
how do I know if the support 2 computers?
http://www.apc.com/products/configure/index.cfm?base_sku=BR1500&full_sku=BR1500 %2B (1)BR24BP&totalwatts=182&&fnl=4605,2&fnl_basket=4605,3c
Back-UPS RS 1500VA
use APC with extra BATTERIES for the best services, their website has time calculators for sizing.
also they have a refurb sales room
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Customer's Server Room