Get some reef putty or IC-Gel, or its equivalent. Put a dollop onto a rock that will hold the torch AND be easy to wedge into the existing structural rocks. Attach the coral and hold still as you can for a 1000 count: this works best by blotting both surfaces, or starting with dry rock, abovewater. Let it sit on the sand in the tank and cure for a day. Then put a dollop of reef putty onto the end you're going to work into the rockwork and shove it where it needs to go. If you ever do need to move it you can break it out of the putty. Unless you plan to have it take your tank, don't attach it directly to the rockwork. Note: if it has a pointy end you can socket into the rockwork, you can use putty to make it stay and you'll still be able to lift it out later.
The brain? Just set it on the sand: they seem to like it when detritus kicks up, so I'd get its growing part fairly near the sand without being submerged.
