Installing LED strips outdoors should be met with special consideration. While IP65 strips are able to withstand small amounts of moisture, splashes and even low-pressure water jets, this doesn't mean that they're built to function under constant amounts of pressure. No matter how you install these, all strips will eventually react in the same manner, with the onset of corrosion being down to excessive exposure to the elements.
It's therefore worth considering IP68 LED strips if you know for sure that your strips will often be met with water. The downside to IP68 is that currently connectors are not available for them, meaning that you must be confident with soldering and customizing to preference, whereas IP65 strips have more available options and can work effortlessly with connectors.