I have one, works great. There's both ios and android apps for it now. Decent range, thru a few walls and a floor to the other side of my house. The alarms are great, especially the ability to set hi-low range on one,, and meat temp on the other.
I believe they would fit the grommets, but can't say for sure, I did my own grommet mod using hollow threaded rod..
'00 Weber Genesis Silver B // '12 WSM 22.5"