The ENH210EXT is a 2T2R design, and as such would need 2 MIMO antennas with similar radiation pattern or a single body 2T2R MIMO antenna with twin connectors for it to work properly. If the 2 antennas are directional, then they need to face the same direction.

See 2T2R MiMo antenna samples below:

The ENH210EXT has N-Type antenna connections. Some external outdoor antennas do not come with the same connector type. Therefore, you would need to purchase a separate cable assembly that would fit the connections of both the antennas and the ENH210EXT.