I think outdoor for -40°C to 70°C device like LtAP mini
https://mikrotik.com/product/ltap_mini#fndtn-gallery
who
- is small
- Power consumption 5-10W/h
- can be power in by DC 8-30V what give you option to power in DIRECTLY from LiFePO4 battery
- can be power even from PowerBank per MicroUSB but this is often have 18650 li-ion inside who can be problem at low temp.
- have slot for secondary ISP SIM if connection will be down at first one, or limit of GB will end.
you can always connect external antenna MIMO2x2 in future
FHD,HD have ~5Mbps, 4K ~20Mbps - all means UPLOUD and this should be tested. This should be possible even by LTE Cat.4, if it's only for 1 video stream then this is my recomentation for
Camera should change a quality of streaming when a bandwidth decreases instead of loose frames.
Alternative with external antenna build-in will be SXTR, is best for bad weather, power must be Passive PoE injector and new revision not work from 12V but start work from 13V... and some additional step-up DC must be mounted. It have 2 sim slots who can be used as failover. More, he have second port as PoE-out and he can power your camera and this way one power adapter can power both devices !.