If you can break a piece of the rock or frag plug off with the polyps still attached that is ideal, you can then glue that chunk of rock to a frag plug. Otherwise i use an exacto knife and I cut the zoa as close to the rock or plug as I possibly can and glur it to a plug. For glue they make a special type of reef safe super glue that is not supposed to be harmful to corals. Be careful not to get the head of the polyp in the glue otherwise it wont be able to open. As for mushrooms Im not sure, never actually fragged em. They come loose fomr time to time and I just put them in a container in the tank with some rock rubble, they eventually attach to one of the rocks and you can then glue said rock to a plug. Ive nenver been able to just glue a mushroom to a plug, there too slimy.
As for mushrooms Im not sure,