How to instantiate objects in a specified place in unity? - unity3d

Question

I have an AR app that displays objects when it detects a QR code. The way I do it is with an empty object called model caller that has an script that instantiates a model, this is the script:
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Android;
using UnityEngine.Networking;
using UnityEngine.UI;
public class Load_Models: MonoBehaviour
{
// Start is called before the first frame update
[Serializable]
public class PlaceModel
{
public string Clave = "";
}
public GameObject[] model;
public string[] clave_modelos;
public string URL;
public GameObject ModeloUI;
public PlaceModel placeModel;
Dictionary<string, GameObject> strGO = new Dictionary<string, GameObject>();
public void Start()
{
StartCoroutine(GetRequest(URL));
for (int i = 0; i < model.Length; i++)
{
strGO.Add(clave_modelos[i], model[i]);
}
}
IEnumerator GetRequest(string uri)
{
using (UnityWebRequest webRequest = UnityWebRequest.Get(uri))
{
// Request and wait for the desired page.
yield return webRequest.SendWebRequest();
string jsonForm = uri;
if (webRequest.isNetworkError)
{
Debug.Log("Error loading");
}
else
{
try
{
PlaceModel model_1 = JsonUtility.FromJson<PlaceModel>(webRequest.downloadHandler.text);
Instantiate(strGO[model_1.Clave], new Vector3(0, 0, 0), Quaternion.identity, transform); //instantiates the model
Debug.Log("Loaded");
}
catch
{
Debug.Log("Error in connection");
}
}
}
}
}
and this is what happens when I detect more than 1 QR (it also happens with only one, just without the models "fusing" with each other):
Explanation: It should display 3 models, 1 simple street (the white block) and 2 "no model" 3d texts, but, the idea is for the models to appear "attached" (I don't know how to word it) to the QR code. And I tried to do it by having model caller as a child of the ImageTarget and with model caller being in the dead center of the imagetarget, also with new Vector3(0, 0, 0).
Is there a way to do this?
I know that I can do it by simply using the prefab by itself instead of a script, but I need for the models to change depending on a website (which I already did).
I'm using EasyAR 3 for this

Answer 1

If I got you right, try to change Instantiate line this way:
Instantiate(strGO[model_1.Clave], transform.position, Quaternion.identity, transform);
Also, maybe, you dont need to set parent transform, it depends from your implementation.