So, you think that by purchase any auto commenting software, you can get lots of quality backlinks ??? Try to do it manual dear otherwise, if search engines notice (If auto commenting software then sure they will) that you are using any tools for spamming then they can slap your website and after that you need to work more harder than current to ranking and high quality backlinks. If you have good budget then try any SEO tools like SEMRUSH to get ideas and help for quick ranking.
You should never use a software to build automated backlinks. You may get some quick results with these backlinks but in the long run, these links are not helpful at all.