The radial mount is very strong, and can easily be ajusted fore/aft. Once you start using radial or back mounts, you will never go back to the clumsy "universal" mounts.
I even use a back cover plate mount for my .15 engines, set up on isolator mounts. Every single bolt of those M4 allen screws holds a ton of force, so that certainly is not the weakest link in the total force transmission train.