Need Advice On Sourcing Rain Proof Electrical Box and Fittings for Low Voltage Wire

[neonturbo]

@velvetfoot

I don't know how to make the low voltage cable entrance into the box water tight.

You want an "electrical gland fitting". Worst case, you just drill a hole and use outdoor rated silicone to seal the wire to the box. I would make the cable or fitting enter on the bottom of the box no matter what I did. And have a drip loop on the cable before it enters the box.