Rancos also only have 1 probe. It's the same issue, you can only plug in identical heat sources, and even then it is risky. (too risky for me) The only time you can get around it is with multichannel thermostats like the herpstat 2 and the herpstat 4 that are literally 2 & 4 herpstat 1's crammed into 1 box.
Herpstat 1: 1 outlet and 1 probe, 1 temperature set
Herpstat 2: 2 outlets, 2 probes, 2 temperature sets
herpstat 4: 4 outlets, 4 probes, 4 temperature sets
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