At least get some risers in between the components. On the cheap side, hockey pucks ( or better, the soft practice-type pucks ). Up from that, rubber/cork pads, Vibrapods, Herbie's Tenderfeet or Edensound myrtle cones with custom threads... and there's a lot more choice than that. The idea is to separate the boxes as much as possible to allow air to circulate, while at the same time providing some anti-vibration treatment. Myself, I would go for the softer, squidgier stuff, but you don't know what you like until you try.
A rack or stand is a more effective but costlier solution. Maybe you can get one custom-made to fit in your wall unit, but even better, get a wall-mounter or three for all your gear ( Target makes single and double wall shelves ) or go for a solid floor stand.
A rack or stand is a more effective but costlier solution. Maybe you can get one custom-made to fit in your wall unit, but even better, get a wall-mounter or three for all your gear ( Target makes single and double wall shelves ) or go for a solid floor stand.