Besides the TTIG called out by @UdLoRa (I’m evaluating a handful on long term test right now) if you can look away from RPi systems an alternate might be the RAK 7258 Micro GW RAK7258 - micro indoor gateway which seems cheap enough and if similar to what I have seen with other RAK platforms shoudl be worth considering - its probably next on my scaled eval list (Q3 tasks) after I finish with the TTIGs and some of the other RAK units I have deployed or am evaluating inc the RAK Outdoor/Enterprise GW eval that is way behind schedule!. Having 100M wired Enet as well as Wifi plus RS232 Console access makes the 7258 potentially more accessible and flexible than the TTIG for not a huge amount more money 
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