The AcuRites don't come with adhesive backing. I used Velcro. I've also got one being held on with a small bolt and nuts and the AcuRite just basically hangs on it like it would if you hung it on a wall. And it's actually easier to remove the AcuRite for cleaning than the velcro ones, and I've got pics of how I did that as well, so if anyone wants to see how I did it, let me know, and I'll post up the pics...
I would really like to see how you did that! I've been trying to figure out what to do with mine [standing, they are not very sturdy]. And also what to do with all of the excess chord wire for the probe.