I dunno, for me, I suppose, common sense prevails here. Don't put sensitive components in places when amplifier heat or magnetic fields can affect performance; and try to avoid excess vibrations, especially with component that rely on mechanical movement.

I can never decide whether to be envious of or sympathetic to people who claim they can 'hear what a component sits on'! I certainly cannot. My experience with the MD600 is that it is indifferent to location or placement (within reason). I'm generally not one to cry 'snake oil' with these things, because I have personally had experiences where things that I doubted would matter have indeed turned out to matter - but those experiences tend to be exceptions rather than the rule.

My Kit: 861v8+ID41, 800v4, UHD722, MD600, MS600, MS200, Oppo BDP-203, Genesis 201, Genesis 350 SE, Genesis S4-8 Sub, BG 520i, VTL MB450 II, Krell Showcase 7, Genesis 928 Subs, Danley DTS10 sub, SVS Ultra 16 subs.