No as stated this is not legal and is standard policy with most software. A license is one usuable copy. If you installed 10 copies with only one license software companies would go completely broke. There is a specific reason as above that there is licensing rules and laws to protect software piracy fraud etc.
There is no grey area in any manner here. The line from your license you quote very distinctly says this
A License grants you the right to run ONE INSTANCE on ONE WEB SERVER and ONE WEBSITE