...I think a "floor cord cover" is what you need. It's a rigid plastic tube, molded like a squished letter D. A slot runs all the way down the middle of the D's spine; at most the distance from spine to belly is 3/8 inch. You spread open the slot, plop the cords in, then close it up. The flat edge is on top of the floor; the curve of the belly reduces tripping hazards. (These also come in heavy duty hard rubber outdoor versions, so useful for public festivals. Indeed heavy duty, as I've rolled over them many times. Wouldn't do that with an indoor.)
More Fun at the Hardware Store
...I think a "floor cord cover" is what you need. It's a rigid plastic tube, molded like a squished letter D. A slot runs all the way down the middle of the D's spine; at most the distance from spine to belly is 3/8 inch. You spread open the slot, plop the cords in, then close it up. The flat edge is on top of the floor; the curve of the belly reduces tripping hazards. (These also come in heavy duty hard rubber outdoor versions, so useful for public festivals. Indeed heavy duty, as I've rolled over them many times. Wouldn't do that with an indoor.)