MSI Z590-A Pro anyone successfully connected 8 or more GPU to this one?

I have 4 PCIe slots and I’m using M.2 to USB pcie Riser Adapter to get the 7 cards. next step is to use pcie to 4 usb 3.0 mining adapters to be able to expand. Anyone was able to get 8 or more card connected to this motherboard? I have 9 cards running on MSI Z390 on HiveOs.