An alternative are complete damping mats, which are placed under the entire machine. These offer better stability than an undamped surface, but there is a risk that the washing machine will continue to move slightly on them. In the worst case scenario, a slight imbalance can even cause it to slip off the mat and cause damage.
In addition to the reduced stability, the appearance is a disadvantage, as the mats are usually black and always visible. Water can also collect under the mat, for example when cleaning the fluff filter, which makes cleaning more difficult.