Attaching small, stretched canvases to the surface of a canvas

Hi All, I have an idea for an abstract art piece that will have an underpainting on a 8x10 canvas panel and then four individual paintings on 3x3 stretched mini canvases attached to the surface of the larger panel (like the pic below). My question is: has anyone ever done a similar application? If so, how did you glue the small canvases to the surface of the larger one? If no one has done this, I’d still welcome any suggestions.

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