Actually Cinnamon is not a desktop environment written from scratch - it is based on GNOME Shell's code. In GNOME Shell the panel is stuck at top and you can't move anything on it without extensions. So, Cinnamon right now only have 3 panel layouts under Cinnamon Settings - Panel.
Looking at the GitHub page of the project (https://github.com/linuxmint/Cinnamon
) you can see a pull request about flexible panel layouts. So, maybe in the next version of Cinnamon the panels are more flexible.