Tube Monoblock location? - Rack or near speakers?

Mike for quicksilver recommends that I place the mini mite monoblocks close to the speakers to minimize the speaker cable length. This will mean rca runs of 10 to 15 ft! This is contrary to everything that I've heard. I assumed that speaker cable runs can be much longer than rca and are less prone to interference and capacitance + resistance?

Any opinions would be appreciated.