How to draw a rectangle at (x,y) in a PyQt GraphicsView?

I'm learning Python and Qt, and as an exercise I designed a simple window in QT Designer with a QGraphicsView which would represent a stack data structure. It should hold the items on the stack as a rectangle with a label representing the item, but my problem is that I can't position the rectangle at(x,y). Google and the documentation didn't help. Maybe it's a simple oversight or it's just me being dumb. This code draws a rectangle in the center of the QGraphicsView, and it should(if I understand correctly)place a 10x10 rectangle at 10,10:

class Ui(QMainWindow):
    def __init__(self):
        super().__init__()
        uic.loadUi('Stack.ui', self) 
        
        self.scene = QGraphicsScene()
        self.graphicsView.setScene(self.scene)
    
        self.scene.addRect(QRectF(10,10,10,10))
        
app=QApplication([])

window=Ui()
window.show()
app.exec()

Stack.ui:

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
<class>MainWindow</class>
<widget class="QMainWindow" name="MainWindow">
 <property name="geometry">
  <rect>
   <x>0</x>
   <y>0</y>
   <width>800</width>
   <height>600</height>
  </rect>
 </property>
 <property name="windowTitle">
  <string>MainWindow</string>
 </property>
 <widget class="QWidget" name="centralwidget">
  <layout class="QGridLayout" name="gridLayout">
   <item row="0" column="1">
    <widget class="QLineEdit" name="lineEdit">
     <property name="sizePolicy">
      <sizepolicy hsizetype="Minimum" vsizetype="Fixed">
       <horstretch>0</horstretch>
       <verstretch>0</verstretch>
      </sizepolicy>
     </property>
    </widget>
   </item>
   <item row="0" column="0" rowspan="3">
    <widget class="QGraphicsView" name="graphicsView"/>
   </item>
   <item row="0" column="3">
    <widget class="QPushButton" name="pushButton">
     <property name="text">
      <string>Push</string>
     </property>
    </widget>
   </item>
   <item row="1" column="3">
    <widget class="QPushButton" name="pushButton_2">
     <property name="text">
      <string>Pop</string>
     </property>
    </widget>
   </item>
  </layout>
 </widget>
 <widget class="QMenuBar" name="menubar">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>800</width>
    <height>24</height>
   </rect>
  </property>
 </widget>
 <widget class="QStatusBar" name="statusbar"/>
</widget>
<resources/>
<connections/>
</ui>

from PyQt5 import uic
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt


class Ui(QMainWindow):
    def __init__(self):
        super().__init__()
        uic.loadUi('Stack.ui', self)

        self.scene = QGraphicsScene()
        self.graphicsView.setScene(self.scene)
        self.graphicsView.setSceneRect(0, 0, 250, 250)  # adjust as needed
        self.graphicsView.setAlignment(Qt.AlignTop | Qt.AlignLeft)

        self.scene.addRect(QRectF(10, 10, 10, 10))


app = QApplication([])

window = Ui()
window.show()
app.exec()