A guy on Kitplanes just posted an idea I actually implemented a couple years ago.
Camper RV spring loaded door latches.
Fold up when not in use.
https://smile.amazon.com/gp/product/B00B96AKF4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I just jam one end of mine in the air vent and call it done .