Place a Window behind desktop icons using PyQt on Ubuntu/GNOME

I'm trying to develop a simple cross-platform Wallpaper manager, but I am not able to find any method to place my PyQt Window between the current wallpaper and the desktop icons using XLib (on windows and macOS it's way easier and works perfectly).

This works right on Cinnamon (with a little workround just simulating a click), but not on GNOME. Can anyone help or give me any clue? (I'm providing all this code just to provide a minimum executable piece, but the key part, I guess, is right after 'if "GNOME"...' sentence)

import Xlib
import ewmh
import pygetwindow
from pynput import mouse

DISP = Xlib.display.Display()
SCREEN = DISP.screen()
ROOT = DISP.screen().root
EWMH = ewmh.EWMH(_display=DISP, root=ROOT)

def sendBehind(self, hWnd):

        w = DISP.create_resource_object('window', hWnd)
        w.change_property(DISP.intern_atom('_NET_WM_STATE', False), Xlib.Xatom.ATOM, 32, [DISP.intern_atom('_NET_WM_STATE_BELOW', False), ], Xlib.X.PropModeReplace)
        w.change_property(DISP.intern_atom('_NET_WM_STATE', False), Xlib.Xatom.ATOM, 32, [DISP.intern_atom('_NET_WM_STATE_SKIP_TASKBAR', False), ], Xlib.X.PropModeAppend)
        w.change_property(DISP.intern_atom('_NET_WM_STATE', False), Xlib.Xatom.ATOM, 32, [DISP.intern_atom('_NET_WM_STATE_SKIP_PAGER', False), ], Xlib.X.PropModeAppend)
        DISP.flush()

        # This sends window below all others, but not behind the desktop icons
        w.change_property(DISP.intern_atom('_NET_WM_WINDOW_TYPE', False), Xlib.Xatom.ATOM, 32, [DISP.intern_atom('_NET_WM_WINDOW_TYPE_DESKTOP', False), ],Xlib.X.PropModeReplace)
        DISP.flush()

        if "GNOME" in os.environ.get('XDG_CURRENT_DESKTOP', ""):
            # This sends the window "too far behind" (below all others, including Wallpaper, like unmapped)
            # Trying to figure out how to raise it on top of wallpaper but behind desktop icons
            desktop = _xlibGetAllWindows(title="gnome-shell")
            if desktop:
                w.reparent(desktop[-1], 0, 0)
                DISP.flush()

        else:
            # Mint/Cinnamon: just clicking on the desktop, it raises, sending the window/wallpaper to the bottom!
            m = mouse.Controller()
            m.move(SCREEN.width_in_pixels - 1, 100)
            m.click(mouse.Button.left, 1)

            return '_NET_WM_WINDOW_TYPE_DESKTOP' in EWMH.getWmWindowType(hWnd, str=True)

def _xlibGetAllWindows(parent: int = None, title: str = "") -> List[int]:

    if not parent:
        parent = ROOT
    allWindows = [parent]

    def findit(hwnd):
        query = hwnd.query_tree()
        for child in query.children:
            allWindows.append(child)
            findit(child)

    findit(parent)
    if not title:
        matches = allWindows
    else:
        matches = []
        for w in allWindows:
            if w.get_wm_name() == title:
                matches.append(w)
    return matches

hWnd = pygetwindow.getActiveWindow()
sendBehind(hWnd._hWnd)