Since container is a solid unit, the ground must be level. Installing the unit on a level ground is also important for proper opening and closing of windows and doors. Solid models or joined containers which will be used for long periods must be placed on a concrete floor. Containers that are fixed on concrete floor using inserts will be robust and steady. However, depending on the needs, containers can be installed on profile, metal legs, wooden purlins, concrete paving, cube shaped concrete legs.