Hanging very large, unframed watercolors

[Robbain]

I seen people secure metal plates (behind the piece) on the wall and then use small super magnets on the face of the work to connect to the wall. Not sure if this is a doable option for works this size?

I've used those Rare Earth Magnets in the past- I think the paper would be too heavy for them. At the moment we're using the original nails in the corners, plus several binder clips across the top, as a stop-gap.