What is best one-time-paid software for backlinks indexer?

Hello guys,
I asked for one-time-paid software for indexing my backlinks.
I need your reviews about GSA indexer is it work? or I must go to monthly services like indexification and one hour?
I'll buy GSA ranker soon and I want a method to indexing it. Should I buy both GSA ranker and Indexer or GSA ranker only?
I am a beginner to SEO world and backlinks?

Im also new to gsa stuf. Following this