Deploy sharepoint framework parts to specific site collection

from my limited reading (and I am only new to framework) it seems like you currently have just two deployment options. 1. the new 'entire tenant' which bypasses the necessity to install the app to a site and adds the app automatically everywhere in the tenant. 2. 'app' installation which leverages the earlier app facilities so you deploy to a site and then the app appears in the app list for the site and then as site admin you have to install the app to the specific site. please anyone who knows better, do feel free to correct me if I have misunderstood...