I've been using the Ultimate Rear Vbar for sometime now and it's dead set brilliant.
This does what exactly what you need it to do. Mount and be stable!
By utilising a double clamp (I.e. all major axis movement has its own dedicated clamp around a cylinder), the mount not only locks down extremely well without excessive tightening, but you can also tighten to the sweetspot that still allows you to micro adjust your placement. Alternatively, you can very easily have macro adjustments by loosening the clamp to the desired point.
Maximum long term stability with effectively 0 wear and tear!
Another simple but great inclusion are the side loaded QD barrels. At face value this seems simple but in practice they are an efficient way to secure stabilisers. Often top loaded barrels without additional features are significantly more likely to vibrate loose which is sup-optimal, especially throughout a tournament.