Created a single prefab to incorporate all the networking stuff. This is the only networking prefab required in the scene. We will see if git breaks it.

Assets/_PROJECT/Multiplayer/CustomNetworkManager.cs

@@ -0,0 +1,40 @@
+using FishNet.Component.Spawning;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Valve.Newtonsoft.Json.Converters;
+using static UnityEditor.ShaderGraph.Internal.KeywordDependentCollection;
+
+public class CustomNetworkManager : MonoBehaviour
+{
+
+    public static CustomNetworkManager instance = null;
+
+    public PlayerSpawner playerSpawner;
+
+    void Awake()
+    {
+        if (!instance) { instance = this; }
+        else if (instance != this) { Destroy(gameObject); }
+
+        DontDestroyOnLoad(gameObject);
+    }
+
+    private void Start()
+    {
+        if (playerSpawner.Spawns.Length == 0) {
+            Debug.LogWarning("Player spawns undefined. Assign a player spawn to PlayerSpawner!");
+        } else {
+            bool hasSpawn = false;
+            foreach (Transform spawn in playerSpawner.Spawns)
+            {
+                hasSpawn |= spawn != null;
+            }
+            if (!hasSpawn)
+            {
+                Debug.LogWarning("Player spawns undefined. Assign a player spawn to PlayerSpawner!");
+            }
+        }
+    }
+
+}