Can you move the entire cabinet forward a few inches.
I built a nearly full size floating back panel for mine. Removable, simply hung on a few blocks I put on the back.
1-1/2 inches clear space between the cabinet back and my floating panel. All edges open for air flow, dark color so you don’t see wires against a painted wall looking thru it. (matte black/brown spray paint would work, I had matching wood)
Then I could cut very large holes in the cabinet back, behind any piece of equipment, lots of air flow, and access to rear panels for wires. Very handy when messing with the equipment.
3rd photo shows the cabinet, you have no idea it’s back has been ’hacked’.
https://systems.audiogon.com/systems/9511oh yeah, The whole cabinet is on wheels, wood skirt floats 1/4" above the floor, move a speaker, pull one end out, get to everything.
I just put 4 of these within the cabinet base, the weight keeps them in place
https://www.homedepot.com/p/Shepherd-6-in-Steel-Tri-Dolly-with-200-lb-Load-Rating-9299/100193474