What would be your advice for placing ads from AdMob?

Question

Android

When registering a new ad unit in AdMob, they write the following:

Ad unit name: [Input box]
Example: "Top banner on the main page"

That is, for each Activity it is possible (or necessary?) to make a separate ad block.
Questions:
1. Is there a difference, whether one ad unit is used in all activities, or will there be a separate block for each activity?
2. If there is a difference, which way is better?
3. Will such a difference affect ad loading? What about income? (You never know. It would seem - a few blocks - more income, is it logical? Or less due to uploading. I'm just guessing, since I haven't worked with AdMob yet.)

Answer 1

1. No, you can use (show) one ad block for the entire application (I even think that you can put one ad block in several applications)
2. ...
3. Several blocks if on one screen, then income is unlikely to increase, rather you will get a ban (read the rules). And if there are different ads on different screens, then this is unlikely to affect the income.
I do it myself -> One ad unit - One application.
Split can be used to split statistics, i.e. Which app screen has more clicks/revenue, etc. or you can show an image ad on one screen and a text ad on another, or you can show a small banner on one screen and a large one on the other.

Answer 2

And also, as some do, you can make the banner sometimes "accidentally" fall into the playing area and "accidentally" click on it. I saw in one program, infuriated the truth of such a banner decently.