try and find a Target TT1 wall mount shelf, flea bay is a good place to look.
solid frame, top platform sits on 4 spikes, works very well. I still have mine sitting in the shed, dont ask !
only downside with the Target is the platform is not very large, a large d/d would probably not fit.
have you tried using your deck on top of your rack, i have a Target D150 rack, 5 glass shelves, tripod, 2 spiked feet front 1 center rear, rare as hens teeth.
my pro-ject expression is on the top shelve, nearest floor stander is less than 2 feet away, no problems at all regarding feed back or skipping, but my floor is solid, wood laminate over a concrete floor.