Look for a model under Wireless for home and office section on routerboard.com.
Search the forums first to see if the modem is even supported. If not, MikroTik may be able to add support for it.

Hello,

Huawei E8278 is recommended. It is not only a LTE USB modem, but also a WiFi Router which supports up to 10 WiFi devices to get connected via LTE WiFi .
See more at: http://www.smart4gwifi.com/huawei-e8278 ... -wifi.html