I leave my Thermoworks Chef Alarm on top during the entire cook and have not had any issues at this point.
I also looked at the thermopro, but went with the Thermoworks. I do wish I had the second unit for the overnight cooks. I may upgrade one day to the Thermoworks Smoke for that reason, or get really fancy and get the Fireboard.
But yes, the Thermopro seems like it would work well, given the number of reviews.
Enjoy!