When I built my miter station, I used simple hardware to make the table of the mitersaw flush with the adjacent bench surfaces.
I attached a pair of 2ร4s under the top of the cabinet where the mitersaw would sit, aligning them with the mounting holes on the saw’s base.
After marking and drilling holes through the benchtop and 2ร4s, I created slots to fine-tune the front-to-back distance of the mitersaw.
In my case, I wanted the fence of the mitersaw to align with the fence on my radial-arm saw.
Lengths of all-thread equipped with nuts and washers secure the mitersaw and align its table with the benchtops on each side. Once the nuts are tightened down, it’s rock-solid.