Securing and placing corals

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Well if all goes as planned I will have my first non-accidental corals in a few days. The tank already has various hitch-hiker zoanthids, clove polyps, and some kind of leather that came in on the rocks. I am ordering blue mushrooms, candycane, colt, and bubble coral.

It is a 120 gallon tank, Mag 12 return, Tunze stream 6060, and 8 x 54 watts T5 lighting. I need some advice on how best to place these corals in relation to lighting and current flow, and how best to secure them to the rocks.

Please before people tell me to add only one coral at a time, I need to batch things together due to the cost of shipping.

For the colt and mushrooms I need to find the best way to attach them to rocks, I have heard of toothpicks, rubber bands, or crazy glue. Is crazy glue mostly just for sps or for soft corals too? Where should I place these with regards to current (away from or nearer to the output from my Tunze stream)? I understand they will want a more shaded area, is this right?

For the candycane and bubble coral, do they just sit on the substrate (sand) or is it best to attach them to the rocks? And will they want to be higher up near the lights or lower down?