True. However, scripture does not preclude the practice in the sense of this topic. (I.e. not idolatry) In addition to ThinkingStuff's examples, there are several places where scripture does show bowing/kneeling as an accepted practice.
"In an interesting passage the verb is used both of "worship" and of "bowing" without an attitude of worship. After Naaman’s healing and his conversion to the monotheistic worship of the Lord (II Kgs 5:17), the Syrian officer asked Elisha, "In this matter may the Lord pardon your servant: when my master (i.e. the king) goes into the house of Rimmon to worship there, leaning on my arm, and I bow myself in the house of Rimmon, when I bow myself in the house of Rimmon, the Lord pardon your servant in this matter" (II Kgs 5:18, RSV). Elisha did not object and said, "Go in peace."
A problem passage is Gen 47:31 where Jacob before dying "bowed himself upon the head of the bed (mitta)." The LXX, however, reads, "And Israel worshiped, leaning on the top of his staff"’ rendering the consonants as matteh "staff." The Syriac and Itala agree; Heb 11:21 cites the LXX. In this context Speiser suggests, "The term ‘to bow low’ need not signify here anything more than a gesture of mute appreciation...." Cf. also I Kgs 1:47 where the dying David bows down in bed."
(http://www.orthodoxinfo.com/inquirers/prostration_heb.aspx)
‡ Peace ‡
None of these were bowing before an object with the object the reason to bow. I'm still waiting to see any positive proof of bowing before an object in honor being acceptable to the Lord.