Design Templates – What's the least inconvenient way to display ads in a mobile app

If I were in your position, I would choose some of the following options:
– very low 10 – 15% of the screen, without covering important features, and with X clear to close / minimize
– if some important features are down, the same is mentioned at the top
– "Floating action button". If you are looking for this in Google, you will see that in the design of the materials, there is a button located at the bottom right of the screen, floating with scrolling. I have seen many registration sites use it as a button to bring up commercials. What can then be easily closed, and in original that does not block the content or the features.