Depending on the surround sound configuration, a typical home cinema system will have 2 or 4 surround sound channels (surround, or surround & surround back). These channels can be on-wall, in-wall, in-ceiling, or freestanding depending on the requirements.
Wall mounted speakers at listening height is the preferred option for audio accuracy, but in-ceiling is a popular choice when it comes to aesthetics and practicality. Ceiling speakers can be a good solution for surround channels, and there are even dedicated dipole speakers designed for the task. But most ceiling speakers will work well as surrounds.