Indeed the SLI/Cross-fire is not supported for server boards.
And if you would like to get both cards to work in the same board, that would not be doable.
Regarding the Compatibility for a single card, yes, the card has a 16x PCIe interfase which would handle the GPU.
Please note that there is a dedicated Communities support for Server inquiries (Servers), if you require any further support about this I would like to recommend you to post your question in their forum.
Hello Esteban C
I am appreciated for your help and well noted for your advise with many thanks. I will be careful for the next time to prevent posting question at wrong place.