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Rubber mat might not help much.
I know brand new fans are almost vibration free but once you get some dust
on the fan blades they vibrate from being out of balance.
The platform might need just a gusset, it might not even be a problem at all.
Some PCs even have piezo power supply cooling, that might be an option ( as long as the peltier PWM doesn't make a worse electronic noise!)
FWIW....
Steve
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