I created a custom holder for my Hydreon RG-15 rainsensor, which also fits the RG-9 and RG-11 sensor. the holders length is 299mm/ 11.77 inch

required parts:
2x M6x30 inbus countersink screws
2x M6 nut screw
2x 4mm screw to attach it to your wall

the cable runs nicely inside the holder to cover and protect it from environmental conditions.

Creality

Ender 5

Doesn't Matter

Yes

35%

you may need to rasp the openings for the nuts a bit to have a tight fit.