https://aliexpress.ru/item/1005003911721041.html?For $50 you can buy a motherboard for 8 video cards, a processor and a cooling system for the processor, and your device costs $30. Goods from China can take 45 days, but if you order in advance, then this is a good and proven motherboard.
Did you use this motherboard yourself?
It looks like a good deal at US$60 including shipping, but I
found one that supports 12 GPU's for $90. However, it doesn't include a CPU, which will cost $30.
So I have to choose between $60 for 8 GPUs (30 day wait) or $120 for 12 GPUs (5 day wait).
I'm leaning toward the 8GPU MOBO because less cards probably means more stability.
I have other motherboards of earlier versions. I watched good reviews about this motherboard, it works fine without complex BIOS settings and the price is very attractive. And it is suitable for beginners who do not properly connect raisers to the motherboard.