Face down, unless the carpet is falling apart with fibres comming off too the touch it's not going to suck any more dust then if you had it on a hard floor. (If you are really concerned about it put something under it.)
Heat rises, you don't want it in your case.
The large fans of current PSU have a far lower Air Flow rate per square inch than the older 60-80mm fans, the sucking pressure is greatly reduced. New more efficient PSUs require less cooling, so they don't need a mini hurricane to keep cool.
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