mang First of all, you need to find out who is expanding /building the fiber network in the city. This can be requested from the municipality or property owner. The installation is then carried out up to the BEP. From there, an OTO socket will be installed as soon as you sign up for fiber, in your flat. I cannot tell you how the socket will then be installed. If there are existing empty conduits, a flush-mounted socket will be installed.
Greetings
Daniele