Theres 1 return edge that you'll see, and the end of the run on each countertop....theres 4 of those. He told me he dislikes mitred edges as 'they look sh**!'
We didn't tile this bathroom but were asked to remove all the trim and mitred all the dado and edges, so if the are any bonding issues - It wasn't me Guv!
We only got involved in the metro tiles because we did this.