Nope u can't use those. It will say not supported in ur region.

1. On top of mirroring you can stream any videos or music (non-mirroring mode) being played from your iphone/ipad to ATV. What I also do is install Plex on my desktop and download movies there. On ATV app store, there is an app called Simplex which can play movies from your Plex desktop server. You can also install plugins in Plex like CNN, Icefilm and etc which you can play on your ATV through Simplex (I believe this is true, as I have not received my new ATV4 yet ).

2. Yes VPN or DNS will bypass the region and you are able to watch some videos in those apps (NBC, History etc.). However, some of them requires US cable subscription. I do think Hulu for TV channels and Netflix for movies are good choicec. I also recently heard of Sling TV which is worth checking out. Hulu, Netflix and Sling TV can be watched through ATV without restrictions in Malaysia but requires subscription.