I've never had Greek Salad with garlic in it but everyone makes it their own special way.
The restaurants I used to work in all had a similar recipe. Cut the tomatoes into biggish chunks, peel the skin off the cucumber and cut down it lengthways. Then cut across it and slice off some big chunks. Fill the bowl nearly half and half tomato and cucmber, add some slices of red onion and green pepper. Either put a slice of feta cheese on top or crumble it over then add 4or 5(?) olives before sprinkling with oregano and adding olive oil.(There was a reason for it being that amount of olives but I can't remember why now)
Nearest I've come to it over here is by using big ripe beef tomatoes.