ORIGINAL: -pkh-
The solution to that problem is to pull up elevator while you go full throttle. You'll have that problem with any sort of wing hold-back, on the bench or on the ground. I don't like tail holdbacks, since the tail of the plane is not usually as strong as the wing. Even on the ground, I use long stakes for wing holdbacks.
The benches are a great aid in setting up a plane and for engine tuning.
The "tip over" is easily handled. I merely use a bungee cord to hold the plane's tail against the bench.
Since this forms a three point hold, there is little chance for the plane to move or get away from the pilot.
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For larger planes, a lower bench may be warrented.