Buy a M2 to MiniPCIe adapter and put it on the free miniPCIe slot with ist over the SIM slot. Set the EM7565 in windows to the right modus (QMI or MBIM), config the LTE-Band witch want to use. Now turn the EM7565 in turris omnia and connect to the network.
I use MBIM to connect to my LTE network, and it is working great. With some changes in the mbim.sh the modul is working great. I also set up a connection checker - this script is pinging 3 diffrent ips. If all 3 IPs says “ping timeout” it will make an automatic usb-reset of the device, because mbim has somtimes problems with an reconnect.