AllSpawn 

Namespace: SynicSugar.P2P
Class: SynicObject

public static List AllSpawn(GameObject original)
public static List AllSpawn(GameObject original, Transform parent)
public static List AllSpawn(GameObject original, Transform parent, bool instantiateInWorldSpace)
public static List AllSpawn(GameObject original, Vector3 position, Quaternion rotation)
public static List AllSpawn(GameObject original, Vector3 position, Quaternion rotation, Transform parent)

Description 

Generate GameObjects, then set UserIDs of all members in Lobby to each NetworkPlayer. (include disconnected users)
If original prefab has many components, this will be heavy.

using SynicSugar.P2P;
using UnityEngine;

public class p2pSample {
    [SerializeField] GameObject playerPrefab;
    void ObjectSample(){
        SynicObject.AllSpawn(playerPrefab);
    }
}