I agree the RAM website is confusing, but the mounts are excellent. My old Lowrance Airmap came with a RAM mount and when I got my Aera 500, the supplied mount was plasticky and cheap by comparison. All I had to get was a simple adaptor and I've been able to carry on using the RAM one instead.
However, if you go to the RAM website you will find the iPad mini holder:
RAM Mount UK
Click on 'Related items'. You'll need the 1" ball.
Then you need something to attach it to. I use a yoke mount on a PA28 (search for 'yoke' finds
RAM Mount UK). My Lowrance also came with a suction mount (
RAM Mount UK) which I used to use in a Robin with a stick.