We always try to use existing anchoring points when hanging our garlands.  If there are none that we can use, we use removable 3M Command hooks.  Here is an instructional video on how to properly remove them.  We also offer free-standing backdrop frames to enhance any design and eliminate the need to attach the balloons to a wall.  Backdrop frames are available to rent with your garland installation order, please fill out the inquiry form for more information!