How can one deal with the purification of restrooms in which employees—Muslim and non-Muslim—urinate while standing, and what is the ruling on that?

The default state of the floor in restrooms is purity, unless one is certain of impurity. It can be purified by pouring and increasing the amount of water. If that is not possible, then one must be careful to avoid contact with impurity. It should be clarified that it is preferable to urinate while sitting, and to use special sandals for restrooms to prevent the spread of impurity.