I don't know about your particular T10 school, but Penn, for example (not mine--I'm higher ) has 99% employmement at graduation, meaning at least 9% of the bottom 10% were employed. Who know what those jobs were, or whether the jobs were the students first choice firm or city, but it's employment.Do you have to be at a top firm? Do you have to be at a firm at all? How about a professor? Look at what you want with your degree. There are, frankly, some jobs that are not available to someone in the bottom 10%. Wachtell, for example. However, if all you want to do is practice law for a firm that you like in a city that you like, why not? BTW, you should really talk to your career services center, as well as your academic advising center. They meet with, oh I'd say 100% or so of the bottom 10% of each class every year. They'll have some advice for you.
If a school has a 99% employment rate at graduation that DOES NOT mean that "at least 9% of the bottom 10% were employed." The 1% that is "unemployed at graduation" might as well be a studnet in the top of the class. In a different situation, your math gives the impression that if a school has an 80% employment rate at grad, the kids in the bottom 20% of the class should be concerned. That is by no means true.