The ears of the rack are provided with screws, which are then not screwed into the 1U device. And a 1U device is definitely not heavy enough to require rails. Do not buy this if you plan to place it in a small home small office rack.
QNAP TS-451D2-4G 4-Bay 4K NAS with Intel Celeron J4025 CPU, Hardware Transcoding, and HDMI Output
16 Review
Diskless Synology πΎ DS218j 2-Bay NAS DiskStation
20 Review
Zyxel NAS326: Personal Cloud Storage [2-Bay] with Remote Access & Media Streaming β Disks Not Included
33 Review
Synology DS220 NAS black
16 Review
8TB Seagate Backup Plus Hub Desktop Hard Drive with Data Recovery Services
56 Review
Game console Microsoft Xbox One X 1000 GB HDD, black
53 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review