Should I glue the glass to plate
For the top tier, it isn't necessary to glue the cake to the wine glass with anything other than BC or RI.
For the bottom tier, if you don't want your support board to show through the glass, you could first cover it with plastic wrap (optional), then cover it with BC which will help to provide a bit of suction to prevent the glass from sliding around.
That might be a good idea. I think the structure in itself is totally fine, I just wonder if it will topple if knocked into...or the table bumped, just by the nature of a wine glass period. (I always seem to topple a glass of wine....then again, maybe that has more to do with the wine itself 
)
Thanks, I am going to put silk flowers in the glass, Do I put a plate on top of 6 inch cake first than the glass - sorry I don't understand!
Yes. If you don't use something to support the glass it will cut into or smash into the cake below when you place the 4" cake on top. I called it a support board/circle (covered in plastic wrap/buttercream), and you are calling it a plate (but you won't be able to get a separator plate that is 4" or 5" in diameter, unless you've got some really old plates because those have been long discontinued). HTH.
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