you dont need the SIM slot, SIM card slot has the Turris Omnia. This one should be work: https://www.ebay.com/itm/M-2-NGFF-Key-E-to-Mini-PCI-E-with-USB2-0-Adapter-WIFI-Bluetooth-4-0/271924395874?epid=1639981617&hash=item3f4ff4ff62:g:eSMAAOSwMmBVnO3K
the EM7565 is connected via USB to the turris omnia. You can configure it.
I dont know, what happen, if you use a board with a sim card slot. I think you can use this one, or the other one in turris omnia. My board dont has a sim slot - and it work great.