No such problem if you are using A shaped glass holder.
Just ask the shop to add A shaped glass holder.
This kind of A shaped holder is used in shops like SupermXX and Big Ship Ship of Mong Kok.
I am using the same kind of holder.
Remember to cut your dividing glass into 2 short pieces and being held by 2 sets of A shaped holders, then there will be no weight problem. Just go to SupermXX or Ship Ship, then you will understand what I am talking about.