I attached these two aluminum Wire Lug things to my grates using stainless steel bolts, nuts and washers. This allows you to very easily mount your probes in a way where they are not directly touching meat or grates.
http://www.homedepot.com/p/Blackburn-1-Hole-2-Conductor-Type-ADR-Mount-Wire-Lug-2-Pack-ADR6-B2-5/100128007
http://www.homedepot.com/p/Blackburn-1-Hole-2-Conductor-Type-ADR-Mount-Wire-Lug-2-Pack-ADR6-B2-5/100128007
