So, I will be boxing up and returning my eero "Pro" 6.  Why?  A picture is worth a thousand words.
 I am sorry, but you cannot put the word "Pro" on this device and not give it a web interface.  That is the #1 reason I am returning this.  Heck, I want web services.
I did call customer service and they confirmed that I could not use the Pro Installer web interface as well.  I wish the Amazon marketeers would have proudly proclaimed that it only has a millennial mobile interface, and I wouldn't have wasted my time. 

Vote for Web UI here: https://community.eero.com/t/k9mtx9/support-for-the-desktop

Look at how much people reference "Browser" functionality in their posts using the following searches: 

https://community.eero.com/search#browser

https://community.eero.com/search#web

Examples:

https://community.eero.com/t/m1hl3td/browser-login

https://community.eero.com/t/g9hmbt6/manage-via-a-web-browser

https://community.eero.com/t/35htgmj/accessing-eero-router-via-pc-web-browser

https://community.eero.com/t/63tfqs/can-i-monitor-my-eero-network-via-a-website

https://community.eero.com/t/h7hk13f/web-interface

https://community.eero.com/t/83htcyl/need-web-access-to-the-router

https://community.eero.com/t/q5bfzv/proper-web-interface

I'll let the product manager do the rest of the work.