All XL and XXL RoKodromo holds incorporated since 2012 this double anchoring system:

You could  fix hold with the center allen bolt and one woodscrew to prevent rotation, or, in the absence of bolt center hole, only with wood screws, resulting equally safe in both cases.

This system allows you to place hold anywhere in the wall, regardless if there are holes available, and is especially useful in competitions, which allows route setters placing holds exactly spot where they need them.