I have displayed one in flight, what I did was took a 1 by 4, a tapered piece of aluminuim, .40 thick, and a few screws.
I dadoed part of the base where the wide end of the aluminuim was screwed and glued in. I worke a curve into the metal first before mounting. Drilled 2 holes at the pointy end to accept the screws.
Next I found relative center of my fusalge, marked the spot through the metal, then drilled those holes. Note this is before the fuselage was closed. After the holes were drilled I mixed 2 part epoxy and mounted recieving nuts to the inside. Completed construction, finish decals the simply mounted the plane to my base.
An acrylic rod can also be used or metal....the key is securing the plane so it won't be knocked over or off the stand. Hope this helps.