I have mine stashed up under the top step in my Kwikee steps. I use step covers and that creates a hollow spot under each step and there is a gap between the two ends of the cover where the springs pull the cover tight. Protected from wind and rain and when the steps fold up for going down the road, the sensor is sandwiched between the two steps and the mounting plates on the frame keep road hazards (debris, turbulence, and driven road spray) from getting to it. The clip on the sensor holds it just fine and I've only had it vibrate off (Oklahoma highway worse than a washboard) and when the steps deployed, there it was, laying pretty as you please on the bottom step.
One added benefit in that location is that I get a pretty accurate temp reading while underway. Plenty of air circulation despite the aforementioned protection. You would think that with what I paid for this coach that it would tell me what the temp outside is, my toad and daily driver do, but, not this beast.