First of all, great post. I have thoroughly read OP and all of your replies several times, but I have got still some questions left:
1: You said 1 proxy per IG account. As far as i can tell you dont log in manually but use massplanner to edit everything. So can I assume that you use the proxies IN massplanner to connect them to the accounts?
2: I saw somewhere that it is better to have a Web 2.0 prelander than a selfhosted one, because it halfes the domain costs and is a subdomain of e.g wordpress.com. Do you use a different Web2.0 account for each prelander?
3: Regarding both prelander and landing page respectively- If they are all in the same niche, do you just let the domains point to the same folder, or do you copy the files over and over, so that each domain has a different folder (which might be safer for paranoia reasons)
Also, I would like to request a PM with your ogads name, so that I can register under you.
Also, thank you very much for your share. I am running around here quite a while, but I wanted to start with smaller steps, which dont require me to learn everything in bulk.