I’m looking for a water sensor to put in my basement. Occasionally my A/C condensate tube clogs and I get water on my basement floor. This could go on for days as I don’t go down there all that often. I’d like to have a ST send me an alert. My question is can these be mounted directly on a concrete floor or would I have to do what I’ve seen others do and have the contacts in a towel that would get wet and trigger the sensor? What sensor would you suggest for this?