There is no place in the Bible that forbids marriage to any number of people. In fact, the part translated that elders etc should be th husband of "one" wife could be translated as husbands of "A" wife-and as the verses go on to describe that a man needs to show that he can manage his own household, this makes sense (the word translated as one is often,in other scriptures translated as "a"or "first".)
However, I would say that polygamy is not something that most would or could accept in our day, and no one should be thinking there is some extra special righteousness in following this practice.