I print ilfochrome classic and use a cold laminator to mount them.
You can get an extremely smooth mount(of course everything is relative) if you use a sander with 100 grit on gator board, and then use light pressure to apply the adhesive and print to the gator... of course you could also use milled aluminum which is beautiful! or masonite.... I would sand the masonite, and make sure the aluminum doesn't have any sharps spots or burs that would hurt your rollers,if you have a cold lamiator.
Otherwise the hinge mounting is best!