Thanks, everyone, for your replies! The glands I found online are all threaded, which doesn't fit with my device. I guess I will go with the junction box solution. Thanks.
I installed the Lorex 1080P IP cameras outdoor, but the RJ45 connection is exposed. I am looking for a protector for it. Here is how the connector should look like. But Lorex seems not selling such gland anymore. Does anyone know where to find one?