First thing, you will have to consider the type of pot you want to use for this type of arrangement. If you want to keep it small, make sure you choose the plants appropriately. As for the number of plants, you shouldn't have more than 2-3 plants in the same pot. However, you can still plant up to 5 plants in the same pot if their size is relatively small. If you are a bit confused, you can also draw a basic layout on the paper. It will give you a much better idea of how you should arrange the plants in the pot. For other guidelines, you can refer to the suggestions shared in this guide.