Go ahead and test it out - this theme is the fully responsive Charis. Resize your screen and watch cleanAccordion adjust to the size.
Anywhere stacks can go cleanAccordion can follow. You will need an additional plugin to place outside of the page element, such as PlusKit.
NONE! There is absolutely no limit… well of course it might look silly after a while if you put too many, and if you put just one it sorta defeats the purpose… but you still can.