I know someone did this already but I thought I would share.
This was a very easy install even the drilling of the counter was easy.
First tape the surface with masking tape.
Carefully measure 5 times then mark then measure again.
Triple check underside for ample room for bottle, this is where I messed up no big deal the bottle is resting on my Air admittance valve but the bottle is soft and form fitting.
A 1/2 inch closer to the sink fixture and a 1/4 closer to the sink I would have totally missed the air admittance valve.
Good sharp twist drill for pilot hole slow speed light pressure as not to chip the counter when it breaks through the bottom.
Then a good sharp 1 1/4 hole saw, same thing, slow speed light pressure then more speed and very light pressure when you get almost through.
Carefully sand all the sharp edges so there are no stress risers to start a crack.
I used a sanding roll on a mandrell in my cordless drill.
This is the dispenser I chose I think it matches really well with the sink fixture.
All in all I am very pleased with the results no more bottles to tend to.