Need some info on TX64 5G Rail Router MIMO

Hi everyone,

I have a Digi TX64 5G Rail router. It has 4 Cellular WWAN Antenna slots. My question is:
If I have a 2x2 MIMO Antenna, can I connect it across any two antenna slots and it will give me 2x2 MIMO or do I have to connect it across WWAN1 + WWAN2 or WWAN3 + WWAN4 to get 2x2 MIMO?