What tolerance off of plumb should a single base station radio rack be installed?

The proper installation tolerance for a single base station radio rack is that it should be just inside the bubble on a level. This means that while it doesn't need to be exactly vertical, it must be close enough to ensure that the equipment operates correctly and remains stable. Being just inside the bubble indicates a slight tilt that is acceptable, which can help in accommodating minor variances caused by environmental factors or building structure imperfections.

If a rack were to be installed exactly plumb, while often preferred for alignment purposes, it might not account for hardware or environmental shifts. Conversely, installing it outside the level bubble could lead to problems such as equipment malfunction, increased wear and tear, or issues with cooling and airflow. Having marks present, as suggested in the last option, does not contribute to the functionality or safety of the installation and instead could introduce confusion or misunderstanding regarding the orientation of the equipment. Ensuring that the rack is just inside the bubble provides a balance of stability and practicality for operation.