如何让pyqt应用停留在像Rainmeter这样的所有窗口的底部？

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout, QLabel
from PyQt5.QtCore import Qt

class BottomWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('Bottom Window')
        self.setGeometry(0, 0, 800, 20)  # 设置窗口大小

        layout = QVBoxLayout()
        label = QLabel('This is a bottom window', self)
        layout.addWidget(label)
        self.setLayout(layout)

        # 设置窗口样式为无边框
        self.setWindowFlags(Qt.FramelessWindowHint | Qt.WindowStaysOnBottomHint)
        self.show()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    bottomWindow = BottomWindow()
    sys.exit(app.exec_())