Gitzos can be fitted with a flat plate or a short column and have adjustable legs, so they can go to a few inches above the ground. Some tripods like the Tiltall have a reversible column, so you can hang the camera upside down. I had a Bogen for many years that had a tripod screw on the bottom of the column, so the head could be attached there for low angle work.
There are also some short tripods for low angle work. I saw a nice wooden one made by Wolf a while back.