Turns out you can fit a 3.5 hdd and a darkrock tf in the ncase m1 : r/sffpc
AsRock Rack 1U4LW-X470 1U Rackmount Server Barebone AMD AM4 Ryzen & Ry – Gigatech Online
Shuttle XPC Barebone Gaming PC - Mini PC, Intel Z270 Express Chipset, LGA 1151 Socket, 4x DIMM up to 64GB, 4x 3.5 HDD Bay, GigE, USB 3.0, HDMI, DisplayPort, VR Ready, No
Slight mod to the hard drive tray allows two 3.5” 2tb drives to fit in the s620 : r/sliger
Amazon.com: Shuttle XPC Slim XH270 Mini Barebone PC Intel H270 LGA 1151 Kabylake Include Heatpipe Cooling Module No CPU No Ram No HDD/SSD No OS : Electronics
Dell PowerEdge R320 4Bay 3.5 1x HS 2 PS H710 Barebone System NO CPU/RAM/HDD | eBay
Office Depot
G242-Z10 (rev. 100) | GPU Servers - GIGABYTE Global
Cisco UCSC-C240-M3L 3.5" 12-Bay LFF Barebone 2U Server CTO - No CPU, RAM, HDD
AsRock Rack RM237-C622LM 2U Rackmount Server Barebone LGA 3647 C622 12 x 3.5" HDD & 2 x 2.5" HDD 1200W RPSU - Newegg.com
Game One - Seagate Barracuda 1TB Internal Hard Drive HDD 3.5 inch SATA - Game One PH