You can just adding the Samsung drives using 2.5" adapters.  Your PC has 3 drive cages and 1 M.2 slot for storages.
Hi! I have a friend who is willing to give me two used Samsung 870 Evo SSDs.  My '18 XPS 8930 has a 0DF42J, with an I7 8700 and a 931 gb Intel Optane HDD.  Can I replace the Optane HDD with an 870?  And, can my tower support more than one drive (if so how many)?  I also have a optical drive (dvd) and a GTX 1060 in the tower as well, I assume that they would take up open slots? Please and thanks for any help/info!
XPS 8930, SSD upgrade questions