Pointing 2 V2 external antenna and Orbi LBR20

Hi, I'm not handy, I'm asking for your help. I have no other alternatives available and I would like to have a minimum of bandwidth at home for home automation and an alarm system and I bought this LBR20 4G router. After inserting the SIM and configuring the router, I understand that the signal is too weak. They suggest I buy a good outdoor antenna and they recommend Pointing 2. I had wired a LAN cable from the roof to my living room. However, I see that the external antenna and the LBR router have two LTE connection cables for the antennas while I have only one wired cable. Running a second cable is difficult. Can it work with just one cable? and if yes, on which of the two antenna connections should I fix it? Suggestions? Thank you