Super glue onto a frag plug or rock like this
1) grab the box of kleenex
2) the superglue gel obviously
3) the rock they will go on
4) get your shrooms in a small thing of water near the gluing station (big enough to eventually dunk the rock into-but not yet)
5) start with a dry rock or if it is one from the tank, set it out and really dab dry the spots where you will put glue.
6) put down glue blobs on the rock for each shroom
7) (here's the only possibly tricky part) one-at-a-time, get the shrooms facedown on 2 fingers. with your other hand take the tip of a kleenex and daub off the water from the mushroom's base. start with a small piece of corner because you don't want the whole mushroom sticking in the kleenex
(not good)
when the shroom base is dry, put a small blob of SG on the base and with the 2-fingers still stretched out holding the shroom, set the shroom base into a glue blob. it helps to pick the rock up and sort of put the rock to the shroom so you don't have to flip your hand over and possibly lose the shroom.
Work steadily, but take your time. A little airtime won't hurt the shrooms. it should only take a half a minute a shroom once you get rolling.
8) when all shrooms are on the rock, carefully lower the rock in the water the shrooms were in to set the glue, rinse the little slick off, and re-wet the shrooms, then into the tank.
the glue going onto dry surfaces makes a huge difference. shroom bases aren't as slimy as xenia or finger sinularias which are pretty tough to glue, so they and zoos work great with this technique.