You can generally only buy iron on wood veneer edging strips that are pre glued.
It is possible to buy "glue film" which is like a thin polythene sheet that goes between the substrate and veneer. It works best with a heated press or in small areas if using a domestic iron, on large surfaces you just can't get the heat into it by hand.
If the fire surround is for a working fire I would be worried about the heat affecting the glue bond.
You can by "flexi veneer" which is edge jointed and laid on a paper backing, this can be fixed with contact adhesive if you don't have a press, but you need a nice even layer of adhesive.
I use a vacuum press and traditional veneer stuck with Titebond II
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