There is a small, but interesting element that retailers should be aware of. If you buy Dynamics 365 Commerce Scale Unit’s you get device licenses included.
It is available in the licensing guide.
What does this mean? As you scale up your installation, and deploy to multiple azure geo zone to achieve the best possible latency, then remember to reduce your number of device licenses according to the number of Commerce Scale Units you deploy.
No need to buy both Commerce Scale units AND devices.
*PS! Always read the licensing guide thoroughly, as there are conditions that needs to be followed.