Here Down Under, we have the luxury of an optional "stacking" mains connector with pins at its "front" and a "thru" socket, immediately behind them, on its "back", known as a "piggyback" plug:
Even so, I too regularly "daisy chain" lighting fixtures via their inbuilt IEC "thru" plugs and sockets (as mentioned by Digital-sound) ...and would love to see that system extended to almost anything that has an IEC power input.
Until that happens, the IEC y-cord (as Don Boomer has suggested) or something like this
http://www.amazon.co...r/dp/B003ADCJTY would seem to be the only viable replacements for a multi-outlet power "bar" or "strip".
In the absence of Digital-sound's excellent hand truck solution, my only other "tip" is to purchase IEC cables for the topmost speakers that are long enough for power distribution to be down behind the lower speakers, a technique that should allow the mains and signal "spaghetti" to be concealed more easily.