From my experience nothing is much good at holding mushrooms in place, the best advice I got was to get a small container and put small rocks or other substrate in the bottom, but the mushrooms on top of the rock, and let the container sit for a few days in a low-flow area of the tank, the mushroom is supposed to attach on its own.
I never had patience for this, I just super-glued a mushroom an hour ago, most likely by tomorrow it will have drifted away.
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