I have three Ikea desktops in my home office, under each I put little eyelets about 6″ apart and every 2-2 1/2′. I then hung the rain gutter, cut to desk length, using 6″ mini bungee cords.
The gutter is large enough to hold cables, power strips and more. All of the cables can be accessed simply by rotating the gutter slightly. There is a little play between the gutter and desk, which allows cables to enter and exit the gutter at any point.
Total cost for 10-12′ of cable management was less than $10. Nothing can be seen unless you bend down and look.