slot

Hi, I have mobo Supermicro X9DRi-LN4F+(https://www.supermicro.com/products/motherboard/Xeon/C600/X9DRi-LN4F_.cfm) and I want to connect 6 GPUs to it. When I connect 3x RTX3060 directly through 16x pcie slots everything works fine. But when I try to use 8x to 16x riser and attach to it one card...

I get that many cards will be placed in systems where there are only two slot spaces on the back but they'll also be placed in systems where there are more, so why not do what sellers of half-height cards do and provide an alternative triple-slot slot-plate for the user to fit?