Q. (Re- question 2546 above). Where is the correct place for the guest to recite the blessing honoring and thanking his host after the meal, during Birchat Hamazon?
A. As mentioned above, there are two established versions of the bracha for the host. Even Haozel (H. Brochos 2: 7), deduces from the Rambam’s wording, that it is an extension of the fourth blessing of benching and should be added at the end of it, without answering amen in-between or reciting then other horachamons. A similar ruling is mentioned in the Mibeis Levy Haggada, quoting the Brisker Rov zt’l, and by Ze Hashulchan (201: 1).
However, Machzor Vitri (p. 52), Tzror Hachaim, Kol Bo, and others, place this brocho at the end of the horachamons.
Horav Shlomo Miller’s Shlit’a opinion is that one should maintain the minhagim and inherited traditions of his family.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a