The amount of water getting on the floor will be the same as any other shower contained in an enclosure be it low level or on a huge riser kit. Basically what’s dripping off you when you get out. Primed and tiled cement board is plenty adequate.
Yep, surviving and hope you're also well. I pop in once in a while to check out the tiling photos. I can only wish we could get the great quality of workmanship where I am that seems to be the norm here.