Another option is the Skyreat tablet mount. It works great for me. Light, compact, and foldable, as well. Several companies make a similar one. Or if you don't mind the bulk or expense, you could always go with a high quality MavMount.
Skyreat:
https://www.amazon.com/dp/B01N7RFDBA/ref=cm_sw_r_cp_apa_nJ5XAbAG76AGT
MavMount:
http://www.mavmount.com/index.php/product-category/mavic-spark-air-drone-ipad-tablet-mount-holder/
Skyreat:
https://www.amazon.com/dp/B01N7RFDBA/ref=cm_sw_r_cp_apa_nJ5XAbAG76AGT
MavMount:
http://www.mavmount.com/index.php/product-category/mavic-spark-air-drone-ipad-tablet-mount-holder/