I recently tested two different 4G routers from Aliexpress.

KuWFi CPF909

https://www.aliexpress.com/item/1005004337636259.html

Round Case, intended for pole-mounting

Protection Level: IP67

24V POE and DC IN: 12V 1A

MediaTek MT7628AN, 8 MB Flash, 64 MB Ram

OS: OpenWRT

The 4G module, the WiFi and the Ethernet modules are all connected by USB internally, the system logs shows the whole dmesg output.

Cellular networks: WCDMA/GSM/2G/3G/4G

Cellular network speed: 150 Mbps

External antenna connectors

2.4GHz Wifi 300 Mbps (IEEE 802.11b/g/n)

Ethernet: 2x 10/100 Mbps

Working Modes: WiFi Mode/AP Mode, Wired Mode/Repeater

Included: 1x 24V/0.5A POE Power Adapter

Price: I paid about 50$

Pros: everything is better than the CPE905, especially the web interface is quite good

BaiBiaoDa CPE905

https://www.aliexpress.com/item/1005002337453017.html

Flat Case, intended for pole-mounting

MT6735WM with 4 GB EMMC and 512 MB Ram

OS: Android 6.0

DC IN: 12V 1A

Protection Level: IP66

Cellular networks: WCDMA/GSM/2G/3G/4G

Cellular network speed: 150 Mbps

External antenna connectors

2.4GHz Wifi 300 Mbps

Ethernet: 10/100/1000 Mbps

Max. LAN Data Rate: 300Mbps

Price: I paid about 50$

Pros: nice flat case

Cons: VERY limited configuration options, e.g. no option to change dhcp dns settings (necessary if you want to use PiHole)