I've done a foam circle cut in half to form a dome ,cpvered in fondant and attached roses to that.
Or molded a peice of foil to the shape I needed it, covered it fondant and used that.
HTH
Here are ones like the photo roses that I have done. The pink one, I used a piece of styrofoam and the red one I just put together by hand like a bouquet of flowers. I actually found that by hand was easier and looked better (a tighter ball).
We'll I can't get them to attach, but they are in my photos.
If you look in my pix, Megan's wedding cake, I did a topper very similar to this. I cut styrofoam to look like a 4 inch cake dummy and made the roses from gumpaste. We didn't have any extra supports or anything that I recall for the topper - it was sitting on top of a 6 inch cake.
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