I am a DIYer.
I did the rough-in for our guest house outbuilding. Concrete slab.
For the centerdrain tub I used a tub-box.
It worked out OK I guess.
I then tiled over the bathroom floor and the stub-out.

Now we are getting ready to do the main house concrete slab which will also have a tub.
Do I HAVE to use a tub-box or can I just make the trap and leave the stub out poking up extra long for the pour? Then later cut it to proper height when the tub is installed?

Quote:

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Do I HAVE to use a tub-box or can I just make the trap and leave the stub out poking up extra long for the pour? Then later cut it to proper height when the tub is installed?

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Can't do that! A tub dap-out,( tub-box) nust be installed because the tub waste extends beneath the floor line to connect to the trap.
Your only other option would be to put the tub up on a platform. Good luck, Tom