I planted 8 trees of 3 different types 2 yrs ago. We are training them like this. We are in NY and just use weights and trimming to make them grow wide and low. In 15yrs I dont want to be climbing a ladder to pick apples. I do the same for blue berries, just trim them to 7' and lower.I prefer Macs for cooking / canning. Mutsu, Johnagold or Sweet Tango for eating. Did you run into the term espalier? The trees are trained to grow more horizontal than vertical. Makes regular care and picking easier. Most of the large NY orchards are moving in that direction.
How to Grow Espalier Apple Trees - FineGardening
Espalier apple trees are a year-round garden feature and easier to maintain and harvest than standard or dwarf fruit trees.www.finegardening.com
Fyi $27 for apple trees is prety standard price. Also you may not want to start with a 5-7' tree depending on the branch structure. My trees where 2' and smaller when I got them and mostly just a single stick. After 2 growing seasons there about 4' tall but 3' wide.