as salam alaikum
according to the fiqh of Ahl al-Bayt prayer without connected lines is not valid and therefore it is not permissible to pray along with others on TV or online. It is good to keep your atmosphere pure and simply to focus on and get the best from your relationship with Allah during your acts of worship, especially away from such modern devices.
Furthermore, in our view it is sunnah of the Prophet to pray supererogatory prayers at home. This view was supported also by Imam Malik and Imam Shafi'i (according to some reports) and Abu Yusuf al-Hanafi.
With prayers for your success.