In this context, I guess each post can’t be thought of in isolation, but in terms of a mini content ecosystem that comprises of a great blog post optimised for on-page SEO, an upgrade to that post tailored for that specific content, various on-page email conversion points including an exit pop-up or similar -and then you combine all this with your off page link building and outreach efforts. That could be over 5,000 words of content all in just that one package.
Brian , your every post is like a book, I always read your post and try to find a few questions to ask .. but to be honest your posts are that comprehensive that, I don’t find a question to ask because you left nothing unexplained ! I wonder how long you take to prepare a post like this, I probably would take a whole year ! 🙂 Good luck Brian. you are a magician of IM strategies.
Some ad platforms will ask more of your landing pages than others, when running ads. For example, AdWords is much stricter, when compared to Facebook. AdWords typically requires that you do not have a ‘thin,’ site that is designed solely to collect leads.  Because of this it might be a good idea to focus on using Facebook or Twitter, to begin with.