The shapes and sizes are crucial in many cases. Both should be adjusted to the store's environment. One of the main rules is that if you would like to introduce a lot of stands in the best places, your stands cannot be too big.
In the picture you can see the reason – the stand cannot block the flow of shoppers. The second thing is that such a big stand will be damaged by shopping trolleys. The final one is store owners’ KPI - the risk is that too big stand might have a lower efficiency per square meter.