Hello, I would like to know more information about the engine it carries: - Dual or single. - Power. - Speed. - Noise. Additionally, I would like to know: - If the structure rests directly on the ground, or has some kind of material between the metal and the ground. - What metal does the structure use? - What is the height of the structure + cable management, i.e. the height of the structure minus the height under the table (available height for the legs). Thank you very much, Eloy