ACan this combo be used or supporting my cake? I'm doing a 6, 9, 12. There is no 9" plate. Can I use an 8" or 10"?

AGrrrr the photo won't upload.

It's Sunny Side Bakery brand separator plates and hidden cake pillars.

ASunny Side Up Bakery, sorry.

USE AN 8"! your board will still be 9" and it will be fine! 

AThank you! I've only ever used dowels before so I'm new to this. :)

With these plates, you will need a larger border, or ribbon border, regardless of whether it is the same size or smaller. And you don't need a plate for the bottom cake, just the top cakes.