Picture in Picture help

We stream using a windows pc with obs, and the atem mini pro
We use a Mac to run scripture, song lyrics and graphics over 3 large screen televisions for the congregation. The signal goes from the Mac to a 1x4 hdmi over cat 6 splitter.

I tried connecting one of the cat 6 lines to the #1 camera input on the mini-pro using the receiver module from the cat 6 splitter but I got no image from the Mac.

What I am trying to do is insert the scriptures from the Mac output overlayed below the Pastor.

Can anyone please help me out with how to do this?

check your HDMI cat6 extender what it need .. what resolution , fps , etc.. U can use direct HDMI cable ?

Thanks. I will check it out