While this clamp is as far as I'm aware the only choice for mounting a r5/9/12 on a table, it is at least a very good choice.
The clamp is easy to use, if you're like me and your sim desk is also your work desk, this mount allows you to mount and unmount your base quickly. It is fairly adjustable and the bushings and foam are effective at minimising vibrations while still being extremely solid. The only flex I saw was the flex of the desk on which it is mounted.

The only downside is that in some situations it is possible that the screws could brush against your legs in some driving positions, however, this has not been a problem with me. So some caution perhaps for people who are very tall or have their pedals and chair very high relative to their wheel.

What can I say, does the job well and opens up your mounting options significantly.