Good questions.
Deresa clams are the easiest and have the least amount of light requirements. They want to be placed in the substrate as well. The reefbreeders should be more than able to project the amount of par it needs to live down there. But you also run the risk of burning up coral near the surface, so it's really going to depend on how the setup is. I would suggest posting a pic of where you want to place him, and I would start with a Deresa.