Topband: 1 center point to ground all 8 beverages??

[dl8yhrfrank at aol.com]

Hi all..
160m season over soon... so think about new setup off beverages..found 
out a new center feedpoint place where i can connect all 8 beverages 
with just a few meters coax to a antennaswitch..annyone knows if its 
possibile to connect all balun ground connections just to one center 
ground point off a cuppertupe some 2.5m in the ground?
Ore does each Beverage need his own ground?
Anny info vy welcome..
vy 73
Frank