Could you cut a hole in the PSU shroud and run the cables behind the screen and down the hole? Double the screen as an anti GPU sag item and hide the cables and the lower portion of the mobo.
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just 3d print a white shroud to cover the cables, and use a blank on the other side to even it out. this is assuming u have one, or know someone with a 3d printer though. if not its an easy thing to get made.
oops saw someone already suggested that.
I think I'm going to try this and maybe make it a lithopane. I just need to make sure I measure correctly and re-level my ender 3.
When I did this I cut a hole in the PSU shroud, hot glued the mounts to the back of the shroud, and then mounted the LED screen. Then 3D printed a bezel to cover the edges. This way the cords are completely hidden behind the shroud.