I use the K&M holder for my ipad. It is very secure.

https://www.amazon.com/s/?ie=UTF8&keywords=k%26m+ipad+holder&tag=googhydr-20&index=aps&hvadid=178332924641&hvpos=1t2&hvnetw=g&hvrand=13103279097375237071&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9012233&hvtargid=kwd-26806949577&ref=pd_sl_160gmkxlbs_e