This was Rose Bowl but much lower than 30. It really depends on how high you are and what angle. You cannot see the b-stage from this angle.
If you're a little further right or left then you're fine. If you can see over the top, you'll be fine.
That being said, get there early and talk to the ticket office/admin office on site. Take a picture of your obstruction and ask nicely if there's any accommodation they can make for you.
I did that at the RB and they gave me front row tickets here:
A really bad situation turned into a fantastic situation, just ask nicely but be prepared if they say no =)
Good luck to you!
Edit: Just looked at the seat map for Rogers Centre, that's about the same section, I hope you're at a much steeper incline than we were. Like I said, ask. The worst they can do is say no. Or beg, borrow and steal to get a GA as back up.