The covers are removable.I don’t plan to cover all of them on the board I’m building. The hole with 1 or two wires going to a controller I will have them on but for the hubs like the eb bars. There are so many wires running through them there is barely any visibilityThrough them and don’t need a cover if you drill the right size hole. Only the outside bezel be used to give clean edges. Given how my set up is, its tough to run wires through the board so i ran the same 6ft extension cables to all slots of the EBs even if they are not in used so i can just easily plug into later which fills the two whole entirely. For the base unit I’ll probably use the cover but may need to shave the opening a bit bigger with a dremmel