change the position of buttons in a QHBoxLayout

[sof4Rou]

I want to change th position of "+" , "Verify" and "Correct" buttons to the top ( next to the headers of the table) . Here is my code :

def SpecForm(self):
        spec = QDialog(self)
        spec.setWindowTitle('Spécifications du Client')
        spec.resize(800, 600)
        main_layout = QHBoxLayout(spec)

        self.table = QTableWidget(0, 3) 
        self.table.verticalHeader().setVisible(False)
        self.table.setHorizontalHeaderLabels(['Object', 'User/Group', 'r    w    x'])
        self.table.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)

        main_layout.addWidget(self.table)

        add_row_button = QPushButton('+')
        add_row_button.setStyleSheet("""
        QPushButton {
            border-radius: 15px;  
            background-color: blue;
            color: white;
            font-size: 16px;
            padding: 0px;
        }
        QPushButton:hover {
            background-color: navy;
        }
        QPushButton:pressed {
            background-color: darkblue;
        }
    """)
        add_row_button.clicked.connect(self.add_table_row)
        main_layout.addWidget(add_row_button)

        submit_button = QPushButton('Verify')
        submit_button.clicked.connect(self.validate_spec)
        main_layout.addWidget(submit_button)

        corr_button = QPushButton('Correct')
        main_layout.addWidget(corr_button)

        spec.setLayout(main_layout)
        spec.exec_()

Can anyone help me ?

[Bonnie]

main_layout.addWidget(add_row_button, 0, Qt.AlignTop)

[sof4Rou]

@Bonnie Thank you very much