https://docs.m5stack.com/en/module/facesII
... where the M5StackCoreS3 can be side by side with some of the modules, so they dont all have to be in one vertical stack.

I do the same thing with Adafruit Feather projects using something like this:https://www.adafruit.com/product/2890)

and for rpi projects uising something like this:
https://www.elektor.com/elektor-raspberry-pi-buffer-board

.. is there a dual stack base somwhere, where the "stack" can be two side by side stacks and share the bus exactlly as if it was a single vertical stack?