Grounded is for any metal on the rack, which mine does. Proportional thermostats are generally better, although it's a personal preference kind of thing. Proportional thermostats use just enough power to keep the temp at whatever you set it at, and on/off thermostats use full power to heat it up, then shuts off at the temp you set it at, then turns back on when it reaches a certain degree. IMO proportional is always better, but on/off ones are generally cheaper.
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