Just to be a little different I do not use ESC braking on any plane. I fly belly landers very often and They include HK mini Saturn, HK reactor, KFM wings, (these run 3 blade props), :The Flying Wing",( An FT Gremlin style flying wing), Numerous Tiny Trainers and derivatives, (including the SpiTTT), and recently a Quick Trick rebuild using a 9x5 SF prop. I cannot remember the last time I actually broke and needed to replace a propeller due to a belly landing.
Add to this a seeming myriad of maidens for the planes I build and pass/sell to other users.
The landing surface used here is normally a manicured hard packed sporting field and not all of them, (the belly landers), land slowly.
All I do when landing is to level off at around one foot in altitude and cut power. A gentle settle onto the ground horizontal sees the prop, (still windmilling), to tap the ground and bounce out of the way before the plane settles onto the ground where friction brings the plane to a rapid halt. I must have done it successfully many hundreds of times without prop loss, even in rather windy and gusty weather.
Landing in tall grass can cause the prop regardless of its position to get caught on the grass and the plane to continue, (a break will eventually occur). Landing in a nose up attitude can cause the nose to impact rather sharply as the tail hits the ground first and acts as a sort of leverage/hinge point for the plane to rotate its fuselage nose down at higher than expected speed. This can actually spear/dig the prop into the ground and the result can easily be a broken prop.
The key to reducing or stopping prop breakage is to do properly thought out and controlled landings and to use decent quality props. OHH, and also do not use 3 or more blade props on a tractor belly lander, on pushers it can be ok as long as the motor is mounted high enough to allow only the prop tips to contact the ground.
Just what works here!