mine is pretty much center. The electrician did it that way. I didn't advise him. Don't have a prob with it.

Good question. Also, what color temperature is best for task lighting? 2700K (warm) or 3000K (whiter) I plan on using 2700K recessed LED lighting in the ceiling.

3000k is much better for task lighting while 2700k offers a warmer light.

As far as placement, if you install towards the center or front of the cabinet then the power lines coming into the fixture from the wall must be armor coated which requires additional work by the electrician. Which ever placement you choose, I highly recommend LED type fixtures for their long life and low heat output.

There's a lot of confusion about running power to these lights. I'm not clear on whether you can have non-armored wiring, even if it's just 12VDC from a basement transformer.

We bought our under cabinet lighting from Inspired LED, found on Houzz. We brought them a pic of our layout and they designed. We put our transformers in our pantry and our electrician ran the wire. We placed them under the front of the cabinet, facing rear. We tried it different ways before placing and got ample task lighting. It also eliminated the dot dot dot on our granite.

If you are using 2700k in your ceiling, I would recommend staying with that. Typically if your are using warmer colors in your kitchen you would stay with the 2700k, if using cooler colors the 3000 or 3500k would work better. Placement typically should be at the front of the cabinet, as that is the work space you will be using. If your goal is to light your backsplash, you could keep it closer to the wall. There are many brands that make their products specifically for forward instatllation and supply proper wires, parts to meet codes.
I'd suggest contacting a local showroom to see the options and get the best layout advice.

This is a home installation I did myself with fluorescent lights from a big box store. They were mounted in front. I linked them together and have a pull cord but would rather have had a wall switch. They are hidden for the most part.