I agree with PE. There is nothing like a ferrotyped print.
The best thing to do with those drum dryers is to pick up a sheet of hot press watercolor paper and put that between the print and the canvas. Then you won't have to wash the canvas which is a real pain. You can just throw away the paper.
I flatten prints with one of those as well. Just put in a stack facing up with the print dryer cranked up and close the top loosely and then turn off the heat. When you come back later they will be flat as a pancake. Works like a charm.
They also work to quick dry a print. Put the print in, give it a few rubs over the canvas, turn the print over, a few rubs, repeat until dry.