"Top/Botton"-setting works, yes.
But if you are releasing a game you must test it yourself.
(Create an app within admob, you do not need to have the app set up in GooglePlay Console. Register your phone as a test device in Admob console, then you will get test ads, but with your real ad-IDs.)
I only wanted to confirm whether top-down setting works
Actually the issue is that Admob has put restrictions on ads,hence I can't even load test ads (I have registered one mobile as test unit on admob site). Hence I asked this question here
Infact even with apps uploaded on play store,ads are currently not working in them whereas earlier it was working. And no of impressions has also dropped on admob homepage
BTW thanks for the reply