Good question @solarslurpie! The Alexa enabled devices should certainly allow for notifications, if not automatically then by setting or skill added. Please ensure your alert toggles are enabled in both apps, as well as checking for any addition Ring/ Alexa skills/ settings for notification sounds.
For the Mac device, we offer a Ring app that will notify through the Mac. When you have a chance, open a browser tab on your Mac and visit Ring.com/app
This web address will automatically prompt the install of the latest Mac app. I hope this helps! 