After checking displacement and tilt of the mirrors from various support points, the tentative support positions will be 1.2"  and 30 degree, (see entry 1060 for their definitions). I'll check the sensitivity along other directions (horizontal), and see if the noise budget will be acceptable or not.

After running more simulations, I got the cavity's length sensitivity due to vertical acceleration. The angle varied between 12 to 45 degree. And the nice point seems to be 30 degree at 1.2".  I will check the length and tilt sensitivity on horizontal acceleration, and compute the noise budget to make sure that seismic noise will be acceptable. After that I'll finish the drawing for the cavity mount.

Note: I just realized that I should have used strain/acceleration unit in the displacement plot. I'll fix that later.