Understanding antenna options and connections for the gl xe300?

I’m working on setting up external 4g antennas on an xe300 with an ec25axd modem. For this varient, does the 4gd ufl connector on the board do anything? I was assuming it would set it up in a 2x2 mimo option, but when i connect my antennas the rsrq value drops significantly as compared to using the internal antennas.
I’m using this for antennas.

I’m using this ufl to sma adapter

I’m hooking 2 antennas to the router, one to 4gm and the other to 4gd.
Am i using the wrong antennas? and if so, what should i use instead?