I found the part about Engram saying he primarily will play the Y and the U roles in the offense to be interesting.
Here is an old article describing what a U TE role is for offenses and some examples of teams that were utilizing them back in 2013. One of those teams is the Packers who McAdoo was the QB coach for at the time.
It makes sense to use Engram as a counter for cover two that is rolling a safety to OBJ. Force the mismatch coverage against the LB or get more one on one looks for OBJ.
The reason I didn't like the fit of a TE with the Giants is because I think their offensive tackles need help with a chipping TE, A TE who can help in pass protection. Rhett Ellison can do that pretty well, but if the Giants line up OBJ Ellison Engram then either Marshall or Shephard will be off the field.