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Switching supplies often radiate their noise thru the AC mains wiring and sometimes the DC output too. You may or may not get a noticeable noise drop if you move it 10' or half a block...
The electric octopus is not a danger as long as you don't overload anything (most are too dumb to check so they advise not to do it, assuming everybody is dumb). Electricity can handle as complex and messy a path as you can give it (the CPU chip in your computer is billions of times as complex as your little rats nest), and remain well behaved as long as you observe ratings and rules.
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