Trixie Protective Grille for Windows (Side Piece)

I needed this guard for the bedroom so I could leave a window tilted open at night. The windows are set deep into the wall, so I don’t need protection on the sides or at the top. Unfortunately, not even the wide ends of the guard fit between my windows (they’re very close together). And they’re too thick to fit under the closed window. Sticking them on wouldn’t work either, as it would all be too unstable—only the bottom rail has a narrowing, so it has to bear all the weight.

Can't be stuck on, only screws are included in the package. For the price, they could have added some adhesive pads as well.