Yes, this has been looked at as well. For the drains in the slab, I am looking at these fat max drains from Sioux Chief (not technically called a floor sink, but is very similar):We like to use floor sinks in place of floor drains frequently. They are better. They have grates thar can be drilled and much larger openings.
That said, I still like the idea (if possible) to have the P-trap above the floor so it can be removed and used as a cleanout. My last house had an old cast iron floor drain that was perpetually "slow", so I had to be careful to keep it clean and keep solids out as much as possible. The drain I have pictured has a nice basket inside to hopefully catch garbage before entering the trap.
Thanks for the feedback.