I have hardwood floors and a longarm. The previous posters that said your frame should never move once it's set up are correct. Once you move it, you have to re-level and re-square it. It is very heavy, so it won't move on it's own. My machine alone, without the frame weighs over 80 pounds. I wouldn't want any kind of cushion under the frame, because as it gets compressed, it can make your frame unlevel..I doubt they'd all compress evenly. I have solid wood floors, but if you're asking about something like laminate..it shouldn't be any different. The danger of denting it is almost zero because hardwood won't dent unless it's banged or something is dropped on it. A stationary object won't hurt it. Think of it like a huge piece of furniture..it's just going to sit there.