[Can't change display name?]

it is now 9 months later and you have probably already solved the problem.
Just in case you didn't and for all with the same problem, who have not solved it yet:
I couldn't change my display name either, however I could after I enabled "view display names" under -Settings -General. 

[Skybox-Shop above Lindenhome?]

thank you, I was already afraid of it, but somehow I was hoping that the rules in this regard would be a little different at an altitude of over 2000 meters.

[Skybox-Shop above Lindenhome?]

I'm considering getting a premium membership and have read a lot about it.
But there is one question to which I cannot find an answer.
If I have a Lindenhome (new generation), then I can place a skybox over 2000 meters.
My question now is: am I allowed to run a shop in this skybox?