AdSense WP Plugins and Placements ?

It's been couple of years since I have touched any of my AdSense sites. But Last week I have started revamping several niche sites and it seems some of those long plugins no longer works. Specially their own WP plugin which I used in most of my WP Sites. Also it seems Adsense has changed a lot adding some new features.

So which AdSense WP plugins do you guys use these days ? Any good responsive plugins, both free and paid. Also which are the best placements for WP site ?