@Elkanah Glad I could help.
You can stack modules one after the other because in some respects something like top_left has no bottom. You can have modules below the bottom of the physical monitor.
If you want modules in a particular order, arrange them that way in config.js
If you are looking for a particular color or say colors that compliment each other you can do a search on “hex color codes” and you will get the hex nomenclature for every color imaginable. Some colors you can just say “black” or “white” and that will work but I’ve personally stuck with using the hex codes for the most part.