I donÂt want to drill into my brick fireplace to attach a trellis. Has anyone had success with these clips before?

See Link Below- These handy clips let you quickly attach anything to brick without in any way damaging either the bricks or the mortar bond. Great for tying up vines, holding a trellis in place, or hanging wreaths on a brick wall. Clips securely snap in place by hand and each can hold up to 25 lb  no tools are needed for installation. Please measure your bricks before ordering. Available in three sizes. Note: mortar line must be recessed; clips won't work on flush or extruded mortar.

http://www.leevalley.com/gifts/page.aspx?c=1&p=10437&cat=4,53200&ap=5