I made this out of scraps I had lying around.
Piece of MDF with a black laminate surface from an old desk.
Four press-in rubber feet.
Four plastic plugs for a wire shelf unit.
Two screws.
An elastic Velcro Strap
A nylon strap with buckle
The rubber feet create a gap for the straps and hold it steady with only two screws. The screws are hidden under the Tablo and go into a stud (lucky).