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Depending on how big your mushroom is. You can use a sharp scissors or an excto knife and just cut it in half. They tend to slime allot so superglue is a bad option. I would just cut the mushroom in half or quarters and place them in a tupperware container with rubble rock. I would then place some bridle vail over the top of the tupperware so the 'room don't float away and place in a low flow area of your tank untill the mushroom attaches to the rubble. That's it... Have fun...
Another option is if you have a lot, just break off a small piece of rock that a mushroom is attached to. Or get a screwdriver and pry off a veneer of rock that includes the mushroom's foot, then super glue that rock veneer wherever you want.