Singleton pattern for Unity3D

Singleton.cs

public abstract class Singleton<T> : MonoBehaviour where T : MonoBehaviour
{
    private static readonly Lazy<T> LazyInstance = new Lazy<T>(CreateSingleton);

    public static T Instance => LazyInstance.Value;

    private static T CreateSingleton()
    {
        var ownerObject = new GameObject($"{typeof(T).Name} (singleton)");
        var instance = ownerObject.AddComponent<T>();
        DontDestroyOnLoad(ownerObject);
        return instance;
    }
}

//usage:
public class GameManager : Singleton<GameManager>
{
    ...
}

Worth mentioning:
This always creates a new object, placing Singletons deriving from this in a scene does nothing as they're never assigned as instances.
Singletons deriving from this should never be destroyed as they cannot be recreated.