One APC UPS power supply to two Mac Mini via one USB control cable

Is it possible to use one APC UPS to control two Mac Mini to shut down when on UPS? The APC unit only has one USB control cable.

I wouldn't buy a PSU today for a high-performance system for any reason unless all of the voltage rails were separately supplied.  AFAIK, only the Antec TruePower series and the PC Power & Cooling psu's can make that claim. Everyone else splits between the 5v and 3v rails, it seems to me--ie, with shared voltage rails the problem can be that when either the 3v or 5v rail demands more power then power is leeched from the shared rail to compensate.  If devices on the shared rail need the power, though, then the voltage dip can cause problems with the devices on that rail and system instability (BSOD, etc.) can result.  When all of your rails are powered seperately, though, all you have to consider is buying the psu that supplies the maximum you anticipate needing for each rail (with some headroom of course)  and you eliminate the shared-rail power dip (a fairly common, often misdiagnosed problem) as a potential problem in your system.
No question PCP&C makes the best psu's money can buy, but I opted for the Antec True-Power 550 True Control instead simply because I can buy two TP550's for the price of one equivalent PCP&C cpu, and the TP 550 offers a few bells and whistles not offered by PCP&C (such as the intake fan which helps cool the TP 550's innards and improves its efficiency.)  All psu's lose efficiency the higher their internal temps go, but of them all the PCP&C psus are the least affected by efficiency loss generated by rising operating temperatures--which is probably why they don't need a separate intake cooling fan like the TP 550.  But the TP 550 has the intake fan nonetheless and is 1/2 the price of the PCP&C psu, and if memory serves the Antec fans are a good deal more quiet than the single fan used by PCP&C.  So it's just a matter of studying the specs and the prices and choosing the one you want.  But I'd constrain myself to these two brands because neither shares voltage rails internally.

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