You need to have monitor plugged in (or dummy plug), and at least X8 PCI-e speed. I'm running 3x 3060 in X99 mobo, but its also possible to run even 7 with x16 risers and appropriate mainboard.
Thanks. This will not be a problem, because it will also be the main GPU of my PC. Of course, this, in some moments, will bring lower profitability. It will be a management issue.