As per the title, if you are not an infrastructure specialist and you don't want to spend hours on installing, reinstalling, debugging the core setup, is there a way to get an out of the box version which is fully installed and working from the start?
For Angular and React apps we don't use anything special from an infrastructure point.
Everything you need is NodeJS and Yarn (which is very common for the web-development).
Quick start for the Anular: https://preview.keenthemes.com/metronic8/angular/docs/quick-start.
Quick start for the React: https://preview.keenthemes.com/metronic8/react/docs/docs/quick-start.