I purchased a Scrapper for mining. Mining guide says slot 7 only, which seemed strange. And, the guide is sometimes incorrect. Example: Ragnor. Which slots have you found work best?
The mining guide is not up to date. You can help by posting on the thread.
To your questions, I think
Scraper would be best using slots 12567,
Ragnar would be best using slots 4567,
Remember to use mouse flight, not turret view for optimal results.