I visualise a Cabinet Bolted to a Wall, being either a Cabinet functioning like a Shelf or a Cabinet is seated on the Floor and fastened to the wall the improve rigidity of the support structure.
Both Methods offer a means to act as a Rigid Support for a TT, and as a result of being fastened in place, will be less reactive to Migrating Amplitude from Ambient Energies within the listening space.
Rigidity and also being a Decoupled Support Structure from the local building structure is the next consideration.
Reducing through Decoupling the Migrating Amplitude to enter the support structure, does show as a beneficial methodology where the End Sound being assessed is evaluated.
The additional steps are not costly, and are worthwhile, even if undoing a set up for a short period is inconvenience.