I'd follow the specifications of the sink. Examples:

• Kohler K-5871-5UA3 Riverby Undermount workstation kitchen sink
• Kohler K-8679-5UA3 Riverby Under-Mount Kitchen Sink

8" on center.

Skip the soap dispenser: ) too much clutter.

SO skip the soap dispenser and for me that garbage disposal too and all of that should be figured out before install when you approved the template for the counter .

The air switch is completely innocuous, barely seen and beyond handy!. A main faucet and the air switch is great! Once the other holes are drilled? They are ........ forever holes in the stone.

Much like a pot filler......make 100% certain you need it

Far better to suffer a bit of clutter than soap bottles habitually placed in the same place trapping soap against the countertop and doing permanent damage.

It's funny, I'm probably weird. I keep good bar soap , hard milled, ( Grandmas Old Fashioned Lye soap ) for hands in a pretty dish as it keeps hands baby soft ! ....... liquid dish soap under the sink, as 90% of everything goes into the dishwasher.

I am a maniac hand washer. The bottle junk, foamy junk, destroys my paws, and the bar? It lasts for MONTHS.