Yeah that was the CNHL one. The main issue is that if you're even slightly too high, you can't close the battery tray anymore (unlike in rigs like Kratons etc where you have a strap as opposed to a bar that clicks in), so better be save than sorry.
I think that's the correct adaptor, yeah.
That Sunpadow or whatever, nah. I personally wouldn't humour that pack (especially not from Amazon) - but i didn't recommend it, so @Stormbringer has to vouch here. 😄
I wouldn't know, i'm german. Nobody is happy there. Just efficient. 😁