Amazon.com: Cooler Master MasterAccessory Vertical Graphics Card Holder Kit V3 with Premium Riser Cable PCI-E 4.0 x16-165mm, Compatibility PCIe 4.0 and Older for E-ATX, ATX, Micro ATX Case (MCA-U000R-KFVK03) : Electronics
Amazon.com: BitFenix Prodigy M 2022 mATX/Mini-ITX Gaming PC Case, RTX 3090 or RX 6900 XT Ready, Vertical GPU and Water Cooling Mounting, Tempered Glass, USB 3.2 Type-C and 2X USB 3.0 Type-A,
MAKE YOUR OWN VERTICAL GPU MOUNTING BRACKET – Mnpctech
Vertical mount GPU in a darkFlash DLM21 Mesh mATX case » builds.gg
XTIA Xproto-ATX case V2 (Instock) – XTIA shop
5 Best Vertical GPU Cases in 2022 - YouTube
Best Vertical GPU Mount For Any Size Case! - YouTube
its... suffocating. this is why choosing suitable motherboard layout is important for matx cases. : r/pcmasterrace
Lian Li O11D Mini: ITX/MATX + Vertical GPU + Top & Bottom Rads = Possible : r/watercooling
O11D MINI PCIe 3.0/ PCIe 4.0 VERTICAL GPU BRACKET KIT