The answer is yes, it is possible to fly drones in a ATC zone, but always subject to a series of conditions and requirements that must be met to ensure the safety of all aerial operations.
With the entry into force of the new RD 517/2024, these operations are made more flexible, given that even within CTR but outside the airport security dilatances and below 60 mt it is not necessary to coordinate an operation with the ATC control, nor to present a Flight Plan.