Cable raceways. Just stick em to the back of your racks, or on the bottom of the shelves and run the cables through em. You might need some you can stick to the wall, if you want, to run cables to the TV. You should also mount the power strips on the shelves, probably the lowest shelf. You can use one if those boxes that conceal the power strips, or use one of those under desk mounted shelves the’that you can put the let power strips on. Along with cables and stuff.