Albert Barnes Commentary 2 Kings 5:24

"And when he came to the hill, he took them from their hand, and bestowed them in the house; and he let the men go, and they departed." — 2 Kings 5:24 (ASV)

The tower - Rather, “the hill,” the well-known hill by Elisha’s house. The hill interrupted the view in the direction Naaman had taken, and Gehazi dismissed Naaman’s servants at this point so that they would not be seen from his master’s residence.