1st I marked in 2 1/4 inches on the 12x12 paver stone to have area where cinder block would sit. Next apply Loctite adhesive on paver stone being generous but not to much it will squeeze out. (1 10 oz tube was enough for 4 applications). Place cinder block on top and position into place. Let set/cure for 24 hrs.
Note: if you need more stability look into using a larger 16x16 or 24x24 paver stone/tile