Spawn prefabs at pre-defined spawn points. There can be a delay before spawning, then the prefabs can be spawned in batches with a delay between each batch.

ListSpawner.cs

using UnityEngine;

/// <summary>
/// Spawn prefabs at pre-defined spawn points.
/// There can be a delay before spawning, then the prefabs can be spawned in batches with a delay between each batch.
/// </summary>
public class ListSpawner : MonoBehaviour {

    public GameObject[] PrefabList;
    public Transform[] SpawnPoints;

    public float SpawnDelay = 0f;
    public float SpawnRepeatRate = 0.5f;
    public int SpawnBatchSize = 3;

    // The way of doing it with InvokeRepeating
    void Start() {
        InvokeRepeating("Spawn", SpawnDelay, SpawnRepeatRate);
    }

    int enemyId = 0;
    void Spawn() {
        for( int batchIndex = 0; batchIndex < SpawnBatchSize; batchIndex++ ) {
            if( enemyId >= PrefabList.Length ) {
                CancelInvoke("Spawn");
                return;
            }

            Debug.Log("Spawning Enemy #" + enemyId);
            var newGO = Instantiate(PrefabList[enemyId]);

            int spawnPointIndex = enemyId % SpawnPoints.Length;
            newGO.transform.position = SpawnPoints[spawnPointIndex].position;

            enemyId++;
        }
    }
}