Unity singleton pattern base class

SingletonBase.cs

public class SingletonBase<T> where T : new()
{
    private static T instance;

    public static T GetInstance()
    {
        if (instance == null)
            instance = new T();
        return instance;
    }
}

SingletonMonoBase.cs

using UnityEngine;

public class SingletonMonoBase<T> : MonoBehaviour where T : MonoBehaviour
{
    private static T instance;

    public static T GetInstance()
    {
        if (instance == null)
        {
            GameObject obj = new GameObject();
            DontDestroyOnLoad(obj);
            obj.name = typeof(T).ToString();
            instance = obj.AddComponent<T>();
        }
        return instance;
    }
}