The object always is to make a machine as rigid as possible. How about a little more information?
What is the construction material of the wall, wood, concrete, etc?
Likewise what is the construction material of the bench and how is it secured to the wall and floor?
Answers to these questions will help people understand the the things that might influence the performance.
I haven't seen this type of construction it's a good shot at an alternative methoid of building in rigidity.