Some prefer speaker level connections and putting the sub between your source and the speakers, but those subs don’t have them. I prefer XLR and two separate subs. One for the left and one for the right. I would stay away from the RCA inputs because they are more prone to noise/ hum. They tend to suffer from ingress issues, particularly on long cable runs. You may also want to consider a sub with volume, crossover and phase control. Maybe those have them, but I didn't see them on the amp's panel. Very difficult to properly integrate a sub into your system without those.
