1)

The shower tailpiece is a straight drop to the "P" trap.
At the "P" trap exit I can go 90 degrees for about 6 inches, then use a short sweep 90 to drop to the 2 inch drain line.
FWIW - the vent (wet) is upstream about 15 inches where the shower will connect.

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2)
As a alternative:

The shower tailpiece is a straight drop to the "P" trap.
At the "P" trap exit I can insert a street 45 into the 90 degrees (P Trap Exit) fitting
then run a longer 2 inch line (about 12 inches) to a Y.


Thanks
David