1- Buy a rack or two from Sound Anchors (they’ll make it/them with as many shelves as you want).
2- Make of have made shelves using two stiff and dissimilar materials (slate and Baltic/Russian Birch plywood is a good combo), with constrained layer damping ’tween the two. Take a look at Wall Damp by Acoustic Sciences Corp. (the Tube Trap company).
An alternative to those shelves are those offered by Symposium Acoustics. Their design is a foam center with a sheet of stainless steel on either side. Not cheap, but some love them.
3- Use isolation devices of your choosing between each component and the shelf it sits on. Roller bearings, springs, Townshend Audio Seismic Pods, IsoAcoustics GAIA, etc.
You’ll never need to replace the above.