BR1 Pro 5G antenna ports - mixing antenna types

Hello!

I have recently upgraded my boat’s router from a BR1 Mini LTEA to a BR1 Pro 5GH (x55) and I want to use the 2 existing antennas that are mounted on my mast - these were previously connected to the BR1 Mini. Note: these external antennas do support 5G. I also have a Peplink 22G 2x2 MIMO 5G antenna that I want to use along with these 2 external antennas on my BR1 Pro 5G.

I have read about the 2-antenna option for this model, but that is not what I am interested in. I will be connecting all 4 antenna ports on the BR1 Pro 5G - 2x single external antennas + the 2x2 MIMO antennas.

My question is about what is the best combination of ports to connect these 4 antennas? The 2-antenna option talks about port A+D - I am interested in what is happening under the hood with these antenna ports. Are some optimized for transmit vs receive? Basically the 2 external antennas have very strong signal compared to the internal antennas but I want to optimize for the best 5G connectivity.

Thanks everyone!

P.S. Also, would there be any difference to this if this was a BR1 Pro 5GN (x62)?