If you wish to use standard sun screen, thermal insulation shades for driver cabin windows in conjunction with the AIRvents one simple method is to just leave on of the suction cups "unattached" (see picture).
For our SOLARscreen Australian Made premium range you also have the option to order the SOLARscreens with a extra pair of suction cups. In this case you can roll the upper part of the SOLARscreen in and hold in place or leave them flapping down below the AIRvents. Worthwhile to consider the extra suction cups when your considering purchasing both items at the same time or you already have AIRvents and like to get some SOlarscreens now.