"lest you offer up your burnt-offerings": and not the burnt-offerings of gentiles. These are the words of R. Shimon. R. Yehudah says: and not the burnt-offerings of gentiles that were dedicated outside of Eretz Yisrael.
"in every place that you see": but you may offer them up in every place that the prophet tells you as Eliyahu did on Mount Carmel.
One verse states (12:14) "in (the portion of) one of your tribes," and another (Ibid. 5) "of all your tribes." As R. Yehudah says: The payment (for the site) from "all of your tribes": the site of the Temple, in "one of your tribes" (i.e., Benjamin).