Using 12 individual videos on 1 screen (to look like a virtual recording)

[#1]

Hi Adobe Community.  I'm creating a video in Adobe Premier Rush in which 24 people recite parts of a message, which we'll edit so each person says a part of teh full message.  I would like to have a unified message at the end.  Ideally, one group would say "Happy New Year," and the other would say, "From ABC Company."  Can I record everyone individually, and use 12 people on one clip and 12 people on the other?  I've figured out how to include 4 videos on a screen and can edit the timing so they're all saying the message at the same time, but I can't seem to add more than 4 videos.  Is this possible?  The goal is to make it look almost like a virtual meeting.  Thanks for any help or suggestions!

[#2]

Hi Adobe Community.  I'm creating a video in Adobe Premier Rush in which 24 people recite parts of a message, which we'll edit so each person says a part of teh full message.  I would like to have a unified message at the end.  Ideally, one group would say "Happy New Year," and the other would say, "From ABC Company."  Can I record everyone individually, and use 12 people on one clip and 12 people on the other?  I've figured out how to include 4 videos on a screen and can edit the timing so they're all saying the message at the same time, but I can't seem to add more than 4 videos.  Is this possible?  The goal is to make it look almost like a virtual meeting.  Thanks for any help or suggestions!

[#3]

I would also like to create a 4 x 4 arrangement of singers. How do I set this up using Premiere Pro? How would I sync the time codes to make sure all 16 voices were starting at the same beginning beat?