you should have no issues using the two onboard M.2 sockets on the xeon w models, and using the onboard motherboard M.2 and a PCI-E M.2 card in the Intel core-x models (i recommend the HP turbo z cards)
also note that the evo line of ssd's have not been validated by hp for use in their workstation line in business usages
what this means is that the performance may not be as expected in some cases due to the evo using TLC vs MLC nand
all ssd's using TLC, have a pseudo buffer of SLC nand and if you fill the buffer the SSD speed will slow down dramatically
if your usage will not fill the buffer, then a evo based ssd most likely be suitable for you
https://www8.hp.com/h20195/v2/getpdf.aspx/c05527757.pdf
http://industrial.adata.com/us/technology/74/