not sure what you are asking...I have used two types of drains, both were plumbed completely and adjusted to be at grade taper for the final pour...I used two pieces of all thread to screed to.
the first is your standard 3 or 4 inch floor drain, no trap, CPVC 3 inch to the lowest side of the form and staked in place with tye wire and jacks to keep it off the bottom and with in the pour.
the better working one I used last time was like a "sea chest" and was a plastic box about 2' by 2' with the drain pipe out one side, sloped to the side of the pour. I used 2 inch (fewer critters and flowed just fine, and was easy to keep clean) using the box, and mounting the drain about 1/2 inch off the bottom of the box which left some water in the box all the time, but I could clean out stuff much easier. Again the top of the box was mounted so as to leave an inch slot all around the top of the box for a drive over iron grate. Screed to the same all thread about 3 or 4" from the box, so a taper could be finished to the drain box.
Either would likely work for you.
