We once fitted our 16" TV to an "under counter bracket" and removable sliding clip. This bracket was then fixed under the overhead cupboards across the front of our 530. Because the cupboards are not deep enough to allow the TV to fold away, we would either leave it down or unclip it when not in use.
It became a bl***dy nuisance so we abandoned the bracket and the TV now sits on one of the worktops. With the seating arrangement on the 550 it's even more difficult to suggest a good spot.
Randa