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Like I mentioned, I’ve been using similar TB3 caddies for a while.
They all use genuine Intel TB controller chips, and are as reliable/hot as the NVME drive you fit inside them.
Case in point, one of my older TB3-only caddies has a 1TB Samsung 960 Pro, and runs very hot. This new one with a 980 Pro gets barely warm. The CNC metal chassis acts as a heat sink for the SSD and the TB/USB controller chips.
For your use case, you can get caddies with 2/4 NVME M.2 slots, which you can fill with 4TB drives. The only hitch is they often need external power, and the performance is capped at 2700MB/s each way no matter how many drives you have running in RAID, as that’s the limit of a single Thunderbolt port.
Literally didn't see your post as I posted mine. Would be paranoid about heat and reliability over time but keep us updated.