I was thinking about getting thumb screws that fit the chassis and put enough washers on it to get the tires off the platform . This way you can display them while you race the others
What I was going to do , is reuse the box and platform they came in but use a few washers between the car and platform , just like have the car on jack stands , then put the plastic lid back on
Mostly on their sides because you can get more in a box. Others sat on their wheels on bubble wrap, no pressure on the tyres and the chassis is supported.