Rather for commentaries I would go for a good book about Pre Han Philosophy and Pre Han Culture = "China" before 211 BCT.
Confucianism, Mohism, Legalism, Logicians, Legalists, Yin Yang School.
Laozi / Dao De Jing is a work of Philosophy of this time and influenced by all of them.
https://www.reddit.com/r/taoism/comments/ljmopu/proto_daoists_thoughts_and_schools_which/
It is more important to understand the roots and the context of Daodejing than to look at the blossoms (commentaries)