You have not only a profound understanding of the project but also...

[MeyaN]

You have not only a profound understanding of the project but also the know-how of ...

You not only have a profound understanding of the project but also the know-how of...

Please tell me whether both of the above correct? (Is using "both of the above" correct?)

 

[Rover_KE]

Yes and yes.

 

[emsr2d2]

Please tell me whether both of the above are correct?

You omitted a word.