Question Can I fit 4 x RTX3090s or 4 RTX 3080s into a single Extended ATX motherboard's PCI-E slots for mining? (My Z390 Godlike)

Do you think I can fit 4 RTX 3090s or 4 RTX 3080s into the motherboard's PCI-E slots for mining?
- hell no,do you see the size of those thing?
Do you need to connect the GPUs with SLI NVLINK connectors for mining?
- yes
How do some people online fit 10-50 GPUs in a single motherboard for mining?
- there are specific motheboards meant for those things,also there are PCIe riser cables.