Question about Electrolux EXP26U759CW

The window kits that come with it are actually hardly usable in our house, unless you could use a sun blind that doesn't have slats to clamp the kit in place. But what always works, but is always a mess, is that you can buy fabric kits with Velcro fasteners, which you then attach to the window, where you can attach the exhaust hose, but you then have to tilt a window at another point in the flat, because the amount of air that is blown out has to go back into the flat. The window kit is intended to prevent this from happening right where you hang the hose out. Monobloc air conditioners are therefore all a mess and very modestly efficient.