Sending Video Through NDI

I am the technical director for my church, and we will eventually be moving to hybrid worship. In person and streaming at the same time. We will have one computer for streaming and another for running ProPresenter. I'd like to send ProPresenter to the streaming computer and it seems NDI is the best solution. Except NDI says it'll use 105 Mbps. I'll have the streaming computer and the ProPresenter computer connected to a network switch that is connected to our modem. So where would my bottleneck in my system be? The network switch if it was a its own enclosed network would be gigabit I believe since it has gigabit ports. However since we are connecting to the modem that has an internet plan, I feel that internet plan will bottleneck us.