Following several questions from various drivers about fire extinguishers and nozzles:
The important regulation is K.3.1.1 which mandates that the system you choose must be installed as per the manufacturers instructions, which will detail the number and distribution of nozzles for the specific system.
https://www.motorsportuk.org/wp-content/uploads/2023/01/Yearbook-2023-COMPLETE-15-March-2023.pdf