Dear Youdont,
Besides the rav, you also need to have the eiruv. If there is no eiruv, yeshivaliet don’t carry. Even if a rav says there is an eiruv. Now, we should be debating what Eiruvin consists of. But you are too hesitant to get to a place where there is no rav than can just declare there to be an eiruv. Guess what? That is what an online forum is.