Powerback Rubber Floor Wire Duct
Your review: I was very satisfied with this product. The wire floor duct was heavy duty and stayed flat on the floor without sliding around, which is typical of others I have seen.
Pros: Easy to work with. Lies flat on the floor and stays there, because of its heavy construction. You can cut it with a hack saw and open the seams for the wires with a utility knife. Holds one large diameter wire, plus up to three smaller diameter wires.
Cons: The cost might be a bit more than your typical wire duct, but it gets the job done.