Hello 3ltOn1
its not really depending on the niche its dependat on Adsense TOS. you need to follow the rules. now some niches do better with 2 ad units others do best with 3 so testting is key , Why not test with Adsense A/B testing for colours also?
Depending on the niche you can place the code for up to 3 ads if already having a regular adsense account ,
Anything above 3 ad units will probably get you banned. I've seen people getting banned because they placed 4 ads in one page.
Adsense has many horror stories mate haha
Adsense is utter sh*it. They can ban you for literally everything, and all your money goes to waste.
BE very, very careful.
Of course you will get ban if you are using ad networks which do not comply with adsense policies.You can put up maximum of 3 ads per page .However you can place more ads if anyone has an adsense premium account.To avoid any ban. I'm having 2 per page. Does it matter where the ads are from? I'm currently only using Adsense for ads, but if I were to use two more of another company's ads would this result in a ban?