Its how people use racks or multiple heating elements on one thermostat. But you have to make sure the heating elements are exactly the same(same size/wattage) or this won't work.
Yes, one enclosure will have the probe to take temps. The second, third, etc enclosures will be probeless and using the first enclosure to regulate its heat since it should be the same.
This works well for heat tape. I don't have any experience with RHP, so I can't comment on it.
Ideally, you should use a thermostat that can regulate multiple enclosures individually, but a power strip works too.
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