The best way I know of is to strap the Anvil down to a very large block of wood. That is the way I have seen it done. You need to deaden the vibrations of the striking hammer blows to take best use of the the Anvil and its density. You could build a pipe stand with 3 to 4 inch diameter x 1/4 inch thick pipe walls for legs and a 1/2 inch plate of steel. As long you would fill the legs with concrete that may deaden the vibration some. Depending on the hight use 2 to 3 inch pipe to build the cross members to keep the legs from collapsing side to side.