Safety standards are enforced for the installation of jacuzzi on the terrace. Your floor slab must be reinforced concrete with a thickness greater than 10 cm. Next, you need to have a location that allows electrical and plumbing to be done easily.
To be safe from the elements and neighbors, you need to apply good insulation. You won't mind outside noise if you decide to install sound insulation at the same time. So that prying eyes don't get in your way, get visual insulation.
If you live in collective housing, these isolations are very important. On the other hand, the noises your pumps, heating system and jets make may disturb others. The same goes for the music you listen to during your relaxation sessions.