Tools like Anstrex or AdPlexity are more to give you an idea of what works right now. You can rip the landers/banners/creatives from there, but you should change it, think how you can improve it (optimise load speed, add testimonials or user's/visitor's comments below, add scarcity etc.), then once you get winning campaign, keep split-testing headers, colours etc. on those landers. I'm just writing from my experience with push notification ads (I've been doing great in 2019 with push notifications traffic).