Tip from the Pros (Flush Mounting Jacks)
or plaster walls, position jacks 12 to 18 inches above
the floor. If the schoolrooms have wide wooden baseboards,
talk with your facilities administrator about installing
jacks there. Plaster tends to crumble when you cut into
it. Wood is more solid. Also, mounting screws don't always
bite securely into the wood lath behind
plaster. However, don't cut a box opening in the bottom
two inches of a baseboard: The wall's bottom plate will
block you from pushing your box in.
jacks where they will interfere with the trim around a
door or window.