RB4011iGS+RM does NOT support mPCIe devices if you solder a socket (...I tried). : r/mikrotik
MikroTik Routers and Wireless - Products: RB4011iGS+5HacQ2HnD-IN
High Speed Industry Router 2.4G/5GHz WiFi 4G 5g Bonding Router with SD, RS485, Gpios Port - China Dual SIM Router Support 2.4GHz 5GHz WiFi and 5g Industrial Router price | Made-in-China.com
Speedtest Wireless Access Point on Mikrotik RB4011iGS 5HacQ2HnD - YouTube
Mikrotik RB4011 router test - ENGLISH SUBTITLES - YouTube
Industrial Dual Module VPN Backp Failover 4G Router with Dual SIM Card Firewall and Serial Port 4 LAN RJ45 - China Iot Router and M2m Router price | Made-in-China.com