I use posy picks like these (they come in different sizes):
http://www.craftcompany.co.uk/index.php/catalog/product/view/id/9029/?gclid=CMaFyIeL3LkCFbQetAodbm8AfA
If you fill the pick with fondant, then it holds the wire in place.
Hope this helps
Amanda xxx
www.facebook.com/amandaslittlecakeboutique