Depends a little on the size of your prints. Up to about 17" x 22" most of those products will hold the print pretty well, but I wouldn't take it much further than that. The peel-off stuff is really designed for flat, relatively low-textured media where considerably more than 50% of the media surface has good contact. Because of its hill & valley texture canvas is only able to bond a much smaller percentage of its surface.
I did a lot of experimenting with much thicker peel-off adhesives about a year ago, like Drytac PSA28255 which is a rather thick, paper back adhesive that you first apply to the substrate or artwork. Much thicker than the pre-applied peel-off products. It worked pretty well on canvas but the whole workflow was too complicated for production. And like all the really strong adhesives it was not squeaky-clean archival. So I finally settled on coating Gatorboard with Miracle Muck using a paint roller, then rolling the print wound around a tube over that. Really fast process. Yeah, it's not pristine archival, so shoot me. But those prints are not coming up anytime soon--unless somebody re-activates the Miracle Muck in a hot press in which case you just lift the print off. Using this technique 44" x 120" is as almost as easy and sure-thing as a small print.
