If you are using long form you probably shouldn’t put the form at the top. It’s like asking to kiss at the beginning of a first date. There needs to be some romancing first, so to speak. If you feel you can close immediately, then you shouldn’t be using long form.
If you want to be obnoxiously in your face about it, you can try a script called “ScrollToFixed” to fix the form to the side of the page as the user scrolls. http://bigspotteddog.github.io/Scroll…
In my work, I’ve found moving the form to a second page works much better for me.