Google "Stark Brothers", they have a hybrid Apple called a "collanade". I had 3 of them and they are very interesting. They are grafted so they grow basically straight up, in a collande. The ones I had, had 3 stems grafted to the main trunk. They grew about 10 to 12 feet tall and about 3 or 4 feet around. They do not spread and the root system wouldn't infringe on the drive. You need to see them to get an idea. I think they would look good in the pics you posted. They are fruit bearing trees. If you call they may have flowering ones too. Give them a call anyway, they are very nice, Joe.