Someone Please Help... No one I've seemed to talk to knows. I am putting a bathroom downstairs in a rental of mine. My questions are about rough plumbing below a slab. What can I use to hold the pipe in place as I set it?
What should I use to cover it in before setting my concrete?
What is the best way to set the drains for my toilet and tub? I have my flange for the toilet. It seems like it will be hell trying to keep that flange in place while setting concrete. How much flexibility should I leave for my tub. Assuming someday I will want to switch out tubs (I also have not picked out a tub for this project yet).

I've done plenty of rough plumbing. Just nothing below grade, like this! Thank you in advance for any advice you can give.

Your pipes are all laid in gravel which totally covers the pipes, they will not move. Do not pour concrte directly on or around the pipe