I did it once and it worked fine. However, if you plan on putting fondant decorations on it (I used the cannoli icing to pipe on cupcakes, then added fondant decorations), these melt gradually over a few hours. I think it's the ricotta cheese or milk that starts to separate in the cannoli icing at room temperature, not sure. If you have to add the fondant pieces, just add them last minute
. It took about 4 hours for decorations to melt/bleed.