Access targets during initialization #129

Hey!
First of all, sorry for using GitHub issues for asking questions but not sure what's the best place to ask for help. I want to ask what's the best way to access targets during the initialization process (according to docs,connectedCallback might be too early to query element from the DOM)? Let's say I'd like to setup / start dropzone on a specific target when component is initialized. When / how should I do it?