Using Patch Panel for CAT6a wiring from attic to closet
My standard procedure:

Put a big piece of plywood on the wall - in this case, the wall shared between the closet and the attic. Make sure you get screws through the plywood into two studs.
Mount patch panel(s) on the plywood.
Feel free to mount other small things, as appropriate, directly on the plywood.
Bring all your cables around one side (top, bottom, left or right - whatever works for your particular setup) of the plywood and into the patch panel(s).