Are these suitable UPS's

Hi All,

I am wanting to get a UPS that can ensure that 4 PoE  48 port Cisco SG switches, loaded around 20 PoE phones and then just PC's are able to keep running for around 5 mins should we get short blips in power, something that does happen in this location.

I have done some digging and seems that this might be a good choice...Eaton 5PX 1.35 kW 1500VA UPS
 

Could anyone tell me, is this suitable or a bit overkill?

Thanks.