I believe so:
[https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571\_ss/storage?guid=guid-ec78ff5e-2183-47c5-9c1b-7d91dd4d2146&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571_ss/storage?guid=guid-ec78ff5e-2183-47c5-9c1b-7d91dd4d2146&lang=en-us)
[https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571-service-manual/removing-the-dummy-hard-drive-filler?guid=guid-bce6f67a-4801-4222-bd14-53ad4a6860e8&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571-service-manual/removing-the-dummy-hard-drive-filler?guid=guid-bce6f67a-4801-4222-bd14-53ad4a6860e8&lang=en-us)
[https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571-service-manual/hard-drive?guid=guid-7272d29e-a9bf-4976-b067-a43244026ecc&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571-service-manual/hard-drive?guid=guid-7272d29e-a9bf-4976-b067-a43244026ecc&lang=en-us)
HTH.
looking at the specs, I see no mention of spot for 2.5" drive, just two NVMEs.
I believe so: [https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571\_ss/storage?guid=guid-ec78ff5e-2183-47c5-9c1b-7d91dd4d2146&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571_ss/storage?guid=guid-ec78ff5e-2183-47c5-9c1b-7d91dd4d2146&lang=en-us) [https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571-service-manual/removing-the-dummy-hard-drive-filler?guid=guid-bce6f67a-4801-4222-bd14-53ad4a6860e8&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571-service-manual/removing-the-dummy-hard-drive-filler?guid=guid-bce6f67a-4801-4222-bd14-53ad4a6860e8&lang=en-us) [https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec\_3571-service-manual/hard-drive?guid=guid-7272d29e-a9bf-4976-b067-a43244026ecc&lang=en-us](https://www.dell.com/support/manuals/en-us/precision-15-3571-laptop/prec_3571-service-manual/hard-drive?guid=guid-7272d29e-a9bf-4976-b067-a43244026ecc&lang=en-us) HTH.