While there’s nothing wrong with this, there’s something you need to know. When plumbing lines are buried beneath a concrete slab many issues can arise. Like leaks, starting with the reaction to the copper piping from minerals in our water.
Copper piping is already faced with the inevitable outcome that it will corrode or oxidize internally and externally causing pin-hole leaks throughout the system. When the plumbing is running beneath your slab this makes it very difficult to get to when a need for repair arises.