M7 and M6 TTL have top plates that are a little higher than other models. You may need to remove the little black plastic stud that is meant to stabilize the goggle finder accessory by resting on the top front corner of the camera. It unscrews, as I recall. Without the goggles fitted, there is no issue at all.
“There is hardly anything in the world that some man cannot make a little worse and sell a little cheaper, and the people who consider price only are this man's lawful prey.”