They can handle more flow than that. They don't look that bad to me, either.
LPS like these are typically found attached to a rock or on their growing colony skeleton elevated above the coral gravel substrate, and not with their "tails" buried in the sand.
If the fleshy polyp is buried beneath the substrate, then I would raise them up and probably attach them to a chunk of coral to anchor them as they grow. They may be fine now but they may struggle if they grow new heads and get bigger when they will be liable to falling over.
Also, new corals often take a bit of time to adjust to the parameters in your tank, especially if they came out of an environment with different levels of nutrients and minerals than are found in their new home.
