The one in the pic is the RHD one, not fitted mine yet as I'm still awaiting the blummin car

but I've always found them very easy to fit (and remove when required). Brodit's website shows hoe they are affixed, see
http://www.brodit.com/productList.html?lrhandDrive=rhd&brand=Nissan&model=Leaf&year=2013&pn=prod
You'll see they also offer a A-post ProClip (the vehicle specific mount) as well.
The Brodit device specific cradles are expensive but worth every penny. And if you use Brodit's 'MOVE' clips to attach your cradle to your ProClip you can easily move one cradle between two vehicles as required.
Of course you don't have to use Brodit's cradles, but they're well made and fit the devices perfectly.
The UK distributor (no commercial affiliation) is
http://www.dsldevelopments.com