Add-on Monitor Mount for Pro-Package DUp to 4 monitor mounts can be added to Pro Package D. You can a monitor mount on either or both towers of Pro Package D. Similarly, you can also place a monitor on either or both of the arches on either side of the arch (inside the under the arch or facing outwards). For viewing by standing visitors, we recommend placing the monitor center 72" off the floor. For placement beside table chairs, we recommend 63" off the floor. The mount allows adjustment