Testing on multiple devices before release - simultanous solution (or tipps/tricks)

Is there a way to test multiple devices at once? Anyone using automation technics to make automatic tests before releasing a new version?

E.g. I'd like to test changing settings and see the visual result on multiple simulators at once. Or changing between a few setting configurations and check if all devices have enough memory to display all possible combinations... And so on.

Doing this manually after each change or improvement of a watchface is quite combersome...

Any tipps are appreciated as well