I installed the Turris Omnia for my parents house with LTE-card, because otherwise there is only a very bad copper cable available.
I did some speedtests/signal tests and the best would be to mount it outdoors on the balcony.
It`s under the roof and a power source would be available.
Did someone install the router outside?
Are there some temperature ratings for the hardware?
Does it need some insulated case to stay alive during winter (max. -20°C during the nights)?