The only racks I've used and really work are Quadraspire. My latest is the SVT2 used in my wife's system. It completely cleaned up the smearing and provided more space between all vocals/instruments. Attack is much better with improvement in sound staging. System is Rega Apollo, Luxman 509X, Mojo Mystique' 3, Decware ZLC power conditioner and commensurate cabling with ATC 20 passive monitors. The rack is beautiful, functional and low slung.
https://quadraspire.co.uk/price/uk/SV2T/natural-black.php