Since you were there already… and if on Windows… let me suggest looking into Odin & TWRP cmd install 
It just opens up a very wide range of ROMs you could install/test, if your are a bit into this sort of thing.
Her is a guide explaining things for /e:
S5 LTE - but the same for pretty much all Samsung devices
And on many Samsung devices I could not get provided /e recovery, so I had to find a TWRP, which again in times don’t work and you have to find another version.
Putting all this in a S9 folder on your computer, use Odin to get a working TWRP installed and then transfer you ROM on a SD card for installing with TWRP works very well on almost all Samsung, as they mostly have SD slots
[edit]: forgot this very good tutorial
[HOWTO] Install /e/ on a Samsung smartphone with Windows easily - eOSWiki / HOWTOs - /e/OS community