SelfService sitecollections in Sharepoint 2019

With Sharepoint 2019 we now have the ability to allow users to create site collections outside their own mysite themselves. This allows for less administration.
The drawback of this solution is that you can only create managed path sites on primary Alternate Access for webapplication. 
Microsofts documentation leaves some holes in regards to how to activate selfservicing functions with powershell in Sharepoint 2019 so I digged for the related values and found settings below. Most are obvious, one wasn't.


Script below




References:
https://docs.microsoft.com/en-us/sharepoint/sites/configure-self-service-site-creation-in-sharepoint-server-2019