If the case is a MagSafe case it will stick to the charging stand without the phone in the case.
I suggest you do not use MagSafe chargers in the car or anywhere else where the phone might fall if the case is not a MagSafe case.
Thanks for that. I can't say I'd trust MagSafe to hold this thing securely in a car even out of a case.
Anyway, I can confirm that the Mujjo full leather case does stick to the MagSafe puck by itself, no iPhone in it.
Personally, I'm not thrilled with the Mujjo case. It's supposed to be all-leather, but it doesn't FEEL like it is. In comparison, I have their leather case on my Xr and that looks, feels, and smells like leather. I don't know if this is a consequence of the design to accommodate MagSafe, but it's just not the same. It does look good though.