How to open multiple Kindle books at the same time? How can I open several instances of the kindle reader at the same time, so that I can have a different book open in each one?

I found this:

Multiple Kindle Windows on PC, Mac

Which suggests using multiple cloud readers, but I want to use the desktop version.
I haven't tested this specifically with Kindle, but it works for most apps that don't normally open a second instance...

In Terminal
open -n
(note the space after -n) 
then drop the Kindle app onto the Terminal window to auto-fill the path to it &amp; hit  Return⏎  

back in Terminal,  Opt ⌥   ↑  then  Return⏎  will repeat that command &amp; should open a second instance.