Do not run a fake installs/review campaign, it will hurt your app and also your Google Play account.
The problem with incentivized installs is that come from people that install your app only to get some coins to use on a game, so they installs a lot or apps daily and uninstall it very quickly, as soon they has coins credited, so on Google eyes, your app suck, because users install and uninstall it in a short data frame.
Fake reviews/ratings are more harmful because Google AI can detect it without any problem, delete it and then tag your app as suspicious, harming your ranking and also closing your account.
If you have make an minimal decent app, and your users can use it and get some benefit, you need to invest in installs from well know sources, not forced, like Facebook, Instagram Twitter and also Adwords. Do it in the first days of you publish your app or update it, and then you will gain traction from organic installs and you will receive a lot of installs from Google Play search results.