An answer tangentially mentions that there are those who say that one should also bow at the end of the Modim deRabanan. This is mentioned in Orach Chayim 127:1, and its foremost proponent seems to be the Rashba, who reports in the name of the Raavad that the discussion on Berakhot 34b is actually about the Modim deRabanan (see also Taz ד"ה גם בסוף), and based on Yerushalmi Berakhot 1:5 (רבי זעירא סבר לקרובה) one should also bow at the end as R' Zeira did:
ר' זעירא אמר ובלבד במודים. רבי זעירא סבר לקרובה כדי לשוח עמו תחלה וסוף.
R. Zeira said, [The obligation is to bow along with the leader] specifically [at the time he recites] the words, We give thanks. [As he recited,] R. Zeira sought to follow [the leader] closely so that he could bow at the beginning and end [of the blessing, We give thanks along with the leader].
However, I've only seen one person doing this by so far. One reason can be that the Arizal was reportedly against this practice, so I assume most Chasidim don't do this (although see Shulchan Arukh haRav). Therefore, I'd like to know which contemporary authorities support bowing at the end as well and which branches of Judaism follow the Raavad in this regard?