Yes, you can, because the two connections are not for the WLAN, they are for the LTE reception. However, I wouldn't recommend this router because its LTE 4G module can only do a maximum of 150 Mbps. That's very poor. And the LAN ports are only old 100 Mbps ports, with a maximum of 32 devices, which doesn't match.
This model Archer MR600 is much better, it can do up to 300 Mbps LTE 4G+, up to 64 devices and also has four Gbit Ethernet ports.
TP-Link Archer MR600
