WordPress - tracking mouse behavior of user

I have a few questions. Is heatmap - http://wordpress.org/extend/plugins/heatmap/ - still a good tool to track mouse movement on a wordpress blog site that uses adsense?

Do adsense policies permit this?

If heatmap isn't still used / valid with latest wordpress, then is there another tool that someone can suggest? I just want to get an idea of what the "hot spots" on my site are, where people click, etc.

Thanks!

I've always used CrazyEgg

We have to pay monthly for it? Any free solutions?

And is it allowed with adsense?