Epoxy sold for this industry isnt sticky. I generally make a small ledge out of it to support the coral and hold it firm for a few weeks until it begins to encrust. Some brands harden within 20 minutes while others take over an hour so you'll want to do this under water. Its much easier to do it smaller pieces that weigh less. I would personally just find or create a relatively flat surface in your tank to just sit yours on if you want to use the whole thing. If you have a specific spot you really want it to grow on you may need to break a smaller piece off in order to epoxy it there.
Another idea would be to use some super glue gel to attach an acrylic rod to the bottom. Super glue sets in a few short minutes and should only be used out of water.
You could then drill a hole in your rock where you want to the coral to go and peg it into place. Depending on the surface you are dealing with you could even drill a hole through the coral and run the rod through it and maybe not bother with the glue.
I've also used rubber bands and fishing line to attach them and they all work well for attaching small pieces.
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