QuoteIt's worth mentioning that the two PCIe5 M.2 2280 slots come with a heat spreader while the third PCIe4 2280 slot sits directly over one of the four fans as shown by the pictures below.
Are you able to confirm that only those two slots are PCIe5? Dell's online manual claims that all three slots support PCIe5 speeds on 5070 Ti+ units, and I've seen conflicting reports of this from various review outlets, all of which were reviewing 5080 or 5090 configs. I ask because the location directly under the fan, when paired with the optional heat spreader, would seem to be the optimal slot to install a hot-running Gen 5 drive.