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I hesitate to use the word "compact", but as UPS go, usually with a bulky SLA battery inside, the Powershield PSD650 is certainly not bulky.
I'm using mine to provide backup power for the FTTC NBN box in my garage; and also to power a simple Google device there. It has two Aussie 3-pin plug outlets. The Powershield PSD650 was definitely good value for money at AUS$100 (what seems to be a long time special price).
Really, the only thing I don't like about the PSD650 is that I can't turn the LED backlight off. It's really bright, not a problem in my garage but it might be for some people depending where their UPS is sited.