Many have mentioned Core. I cannot afford Core though the build quality is quite stunning. I’m digital. So turntables. I cannot advise.
On a poor man’s budget I use a Zoethecus 3 tier rack. Before that I used mid century modern furniture for my equipment. Mighty difference. Everything tightened up and became more layered in sound.
WAF of my cherry tier rack would work. Core as well. Many different finishes are available.
If I had the money I’d go for Box. I’m surprised no one has mentioned. It’s built with interlocking wood joints The way furniture was made beyond decades ago. WAF would work as well.
I have not tried any steel racks, so I cannot state the SQ delivered. Herbies gliders are excellent as well Herbies gliders provides additional isolation and allow you to pull your rack from the wall for adjusting cables and swapping gear.
Happy hunting !