Hey Adsense has recently changed their policy, I will recommend not to use adsense on your faucet as it will get banned sooner or later. Try Adsterra, its the best alternative you can try, They have higher CPMs plus they pay in BTC too.
Adsterra also requires 1M alexa rank. If your faucet template is unique definitely coinzilla will accept your site. You can also try propeller ads pop advertisements as well as its direct link. You can Put the direct link in a iframe in your site. But the only drawback is its high threshold for payout. You can also try pubovore , coinmedia and bitcoset. These three adnetwork sites accept new faucet sites. You can also try this adnetwork
http://adsmajor.com. Its a new site. There are no proof of payments and reviews available about this site in net since its new.