[Unity] singleton pattern base class

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BaseManger <T>where T:new()

{
    private static T _instance;

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

}

When used, inherit directly behind the class.

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Inherited Monobehavior's singleton writing

public class BaseManger : MonoBehaviour
{
    public static BaseManger instance;

    private void Awake()
    {
        instance = this;
    }
}