[EricH]

The tray I suggested carried a tab-and-pin stand-in (the wire at the back).

The reason for the platform is that it can carry anything. Stability--and getting it to the pole or the base--is the problem of the team who builds it, but as a caution to those teams: If the minibot isn't reasonably secure, stable, and reliably targeted onto the post however it needs to go on, teams will not trust you with their minibots. As such, it is in your best interest to build a stable, secure platform.

I also like the tab-and-pin setup that darist posted as being likely to be easily fit to any minibot and reasonably secure. I think the biggest problem is that the cutout is a bit big, such that a small minibot can fall right through, but that's easily dealt with by decreasing most of the size as needed and only leaving a wide pole-contact area.