Competitors visibility score can go from 0, if the competitor is not ranked for the keyword you entered, to a 100, if a competitor is ranked first on Google for the keyword you entered. Please note that it is important to remember to consider the region of the keyword that you wish to rank for. The rank depends on the tracking region of the keyword.
On each individual website you are allowed to add up to a 100 keywords, although the recommended number is no higher than 20.
This is how the competitor visibility score is calculated. On a single website, if a competitor score is 60 for the primary keyword, and 50 on the second, the overall result for this competitor will be 55.