Base script

using System.Collections.Generic;
using UnityEngine;

public class EnemyFireProjectileBase : MonoBehaviour
{
    [Header("Projectile settings")]
    [field: SerializeField] public GameObject[] m_projectiles {get; private set;} //Projectiles are pre created to save on performance
    [field: SerializeField] public float m_speed { get; private set; } //Speed of projectile

    [Header("Fire settings")]
    [field: SerializeField] public float m_firingInterval { get; private set; } //Firing interval between bullets

    [field: SerializeField] public float m_cooldown { get; private set; } //Cooldown between volley

    public Rigidbody2D m_rb { get; private set; }
    public List<Rigidbody2D> m_rbList { get; private set; }
    public Transform m_player { get; private set; }

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        m_rb = GetComponent<Rigidbody2D>();
        m_player = GameObject.FindGameObjectWithTag("Player").transform;

        m_rbList = new List<Rigidbody2D>();

        for (int i = 0; i < m_projectiles.Length; i++)
        {
            m_rbList.Add(m_projectiles[i].GetComponent<Rigidbody2D>());
        }
    }
}