It will grow well mounted, in worse conditions than you have. Doesn't matter what you use, although tree fern will probably last a bit longer.
Might I suggest, however, that you mount the piece that is crawling out of the pot, and leave the rest where it is? You've already figured out how to grow it in a pot, I wouldn't risk the whole plant on the mounting experiment. Another option is to not even detach the cutting, just let it root onto a mount placed next to the pot, and then at some future point separate the two.
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