I listed all the POIs in my SOP, as well as in the application, also because in my SOP I explained the reasons for my interest in them.
Last year's results page shows that the first acceptances went out at the beginning of January, and the last ones in April (if I remember well), thus there is a huge time period during which to be anxious ?
The only POI I (kind of) contacted is a professor that explicitly stated to submit a form if interested in being supervised by him, but I haven't heard back from him yet (even though I think he visited my homepage) and I haven't had direct contact, such as an e-mail, with him.
I think it is not that necessary to contact them, even because on the department's FAQ it's stated that "Your application will be read by one or more members of our Admissions Committee. The best applications are then sent to faculty members in each applicant's research area(s) for additional comments. Some applicants are contacted for additional information or for a telephone interview." Thus, I think that, if we pass the first screening, our applications will be forwarded to the POIs as well.
My biggest worry is that I come from a kind of unknown Engineering School (even though it is one of the top ones in Europe), and I have no clue about my GPA conversion (of course I checked with their tool that is greater than B+, but I don't know how much greater it is).
Moreover, I listed my POIs in the form with the format "Prof. Name Surname", and not by surname as stated before. I realized it a week ago, and I hope it won't affect me in any way ?