I have the Silverstone GD-08 case that can fit 12 hard drives. It’s an inexpensive solution for a dedicated htpc/media server. Even managed to fit in an RX 6600 so my wife can play low spec games on the tv.
Then all you need is a pcie expansion card as others suggested.
Lol. System requirements are 30, 40 & 50 series cards with 12GB of VRAM. Most of the cards do not have this due to Nvidia’s stinginess.