We have left out Rambam's statement, "one who accepts them is called a Ger Toshav (a Gentile 'Resident' of the Holy Land)," and the laws of the Ger Toshav, because they do not apply while the observance of the 50-year cycle of Jubilee in the Land of Israel is suspended, as Rambam writes in Laws of the Worship of Stars (and Idols) 10:6. If a Gentile declares his acceptance of the Noahide Commandments before three observant Jewish men, it does not change anything in regard to his obligation to observe the Noahide Code, or his merit to be called one of the Pious of the Nations (Hassidei Umot HaOlom, in Hebrew). See Likkutei Sihot, vol. 26, p. 134, which explains that this is the opinion of Rambam. This appears to also be the opinion of Rashba in Torat Habayit, quoted in Beit Yosef Yoreh De'ah ch. 124, which says, "And we do not require him to accept them in front of a Jewish Court of three..." It seems clear that Rambam rules that nowadays, if a Gentile wants to act as a Ger Toshav, Jews should not prevent him from living in Israel (the Divine Code by Rabbi Moshe Weiner, Ask Noah International, 2018, p 57).