Not exactly. I bought a wheelstandpro in November 2010, initially for my Driving Force GT and M$ Wireless wheels. I got an adapter for the M$. When I later bought a Fanatec GT2 wheel, I was able to use it with the wheelstandpro. Two of the holds matched up for hard mounting and I also used the Fanatec clamp. I later got a Fanatec CSR wheel and it also mounts just fine to the wheelstandpro, even though it was bought originally for the Driving Force GT. The problem here, however, is that the T500RS is big and heavy, and I am confident it would not mount well to my wheelstandpro, which is not reinforced enough to support the additional weight. It also lacks a mounting plate that is big enough, IMO. So, I use my Rennsport wheel stand for my T500RS.
So, the wheelstandpro is flexible, just not as flexible at the Rennsport wheel stand.