Or for few dollars investment, Dadant now has a nuc intro top board..
Place board on top of 2 mediums, and nuc on top of that. Simple.
If its a Jester nuc(plastic), just pull frames out and set in pair of empty mediums til you cut bottom of Jester out n duct tape that to board, replace frames in nuc, close entrance so they go through mediums. They will eventually move down.
Sidenote, make sure you have something underneath the empty mediums before temporarily placing nuc frames in there. Many a queen has been left on ground and stepped on, left out, etc.
Dadant 2014 catalog- Nuc intro board #B91401