If you mean installing a 3" x 2" low heal outlet directly below the toilet with the 2" outlet horizontal with the 3" turn, then no you can't do that.
I have been using side outlet tees for over 30 years
And have not had any problems with the tee being clogged
the tub washes the vent
only problems I have seen are ptraps full of hair
back to back
I threw in that side inlet tee as an example of what I have seen.
But have you ever used a side inlet 90 like the last to pictures where the WC dumps into the 90. I think that is the OP original question.
Not really sure what his intention are.
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