I have Boox Nova and I would like to get a cover too. Actually I like this one
https://www.youtube.com/watch?v=gH8OSYt6rZw but it is for iPad Pro.
The reason I like this is because:
1. It is very easy to remove the device (magnetic). Actually I can add several magnets on the back of my Nova to get the same effect.
2. It can stand (The original cover is just so original). But I can mod the original cover using this one