The high places - i. e., the two sanctuaries at Dan and Bethel.
For the devils - literally, “for the goats:” probably the word is used (as in Leviticus 17:7) for objects of idolatrous worship generally.
Related Commentaries of 2 Chronicles 11:15
2 Chronicles 11:15
15 And he ordained him priests for the high places, and for the devils, and for the calves which he had made.