I use the Gorilla clear mounting tape, super strong but yet removable without any damage or residue.
http://www.gorillatough.com/gorilla-mounting-tape
I also use re-closable scotch strips, think velcro with no fabric side, its two plastic sides that lock together extremely well.
http://www.amazon.com/Scotch-Reclosa...PWCV1SDXY29QG0