We had both Zena and Zeus for over a year together, both rescues. It was difficult in the beginning, the damage that can be caused before you are a pack.
The seperation anxiety with mastiffs can be a fininacal setback to say the least. I would change nothing.

Here are both of them together. Still learning how to post. I don't know how Julie gets her dogs to sit still and pose. Her stuff is great!

Yup. That's a lot of dog. I am sure it is a total drool fest.

James