Cable Tie Mounting,100 Pcs Zip Tie Base,5 mm(M5) Screw Hole, 23x16x9(L*W*H) mm Cord Tie Mount Wire Tie Holder Fix Bottom Wire Management for Home/Office/Outdoor/Garden

I built, from scratch, a custom game console shelf waaaaay back in 2001 and what I did was attach wire ties directly to the back edge of each shelf and carefully bundled up the cables from each console and routed them along each shelf, hidden perfectly out of view. Photo of my Game Shelf around 2004 You could do the same thing with something like these anchors: https://www.amazon.com/dp/B086QFH27W You only have a few cables to contend with per shelf opening so it will probably be simple enough.