Many BJJ students ask how they can escape the rear mount. A better question to ask is: “How can I prevent getting my back taken in the first place?”
This detail on how to make the correct frame when performing the basic elbow-to-knee escape from mount will make it much more difficult for the opponent to slide up to technical mount and take your back.
Most often I see students give their back while attempting to escape from the mount. Try adding this detail and see how it cuts down on how often your opponent gets your back.