I have been looking for hooks to hang my pool pole on our aluminum fence. I've looked at Lowe's and Home Depot and have not found anything that was thin enough and did not require drilling holes. After searching on this site and the web, I have finally found the answer. They are a little pricey, but they meet my needs.
http://www.fencehooks.com/poolaccessory.php
http://www.fencehooks.com/poolaccessory.php