Re: automatic uppering alternate bracket in case of chord

[Albert Einstein]

Must I copy this: \override Staff.VoltaBracket #'minimum-space = #7 into 
all \new Staff conected via \context ChoirStaff?
It works in case when I paste it only into first.

Is it possible to display volta bracket above each  simultaneously 
repeated staff, not only above top?
And is it according to rules in case of choir or orchestra?

Albert