Yeah the asus maximus viii hero only has 1x M.2 so max is 7 cards. Using NGFF to PCI-E X4 slot adapter got them from amazon. Plug and play no need to connect the 4 pin power that comes with it.
You can get the Asus Prime Z270-A has 2x M.2 gives you a total of 9 cards pretty cool plus them asus boards are so easy to setup and mine better than asrock and biostar.
Tell me how it goes if you decided to get one.
Cheers.
I have an Asus Maximus Hero VII, and if you enable M.2 socket you loose the PCIEX1_1-3. There's no way you have the 7 connectors at the same time on. either you loose M.2 or you loose PCIEX_1-3. you Don't you have the same behavior on your Hero VIII?