There's only one game in town: Mockett & Co. Every single one you see anywhere is derived from this. They are nowhere near 500 either. Around $150 shipped! Here is a link that might be useful: power pole

Wow. The guys on that inspectors forum seem to take great joy in finding interpretations making something illegal. So you might have some trouble getting it past your local inspector and would need to ask beforehand. It looks to me like it should meet the intent if you had enough of them to match the standard fixed receptacle requirement, and if the UL testing covered the specific type of installation. I don't see why they are comparing this to an extension cord from another room. If the UL testing covered the flexible cord as part of the device, I see no added hazard. You aren't going to overload it, walk on it, or trip over it. Some of them even seemed to be ok with the safety of the cord, but wouldn't count it as meeting the requirement for a kitchen counter. Seems to me if you have the required number always available for use, how it is connected is unimportant.

Just wanted to let you know that we have decided to use Sillites for outlets along our main wall. These are single receptacles that are self-contained units with no need for separate junction box. So all you need is a 2" hole in cabinet or windowsill. Not sure if that works for you given your layout, but wanted you to know of another option that does not require drilling down into your counter. I do have a friend with a Mockett in her island and she LOVES it! Says it is no problem to clean around it at all. Good luck!

You want the cut outs in the granite made in the shop on the CNC machine or with a water jet. Jimmy and his grinder on site are going to have to make the stone significantly weaker to get a nice square. You don't want "square" square either. A bit oversized with radii in the corners is much stronger, like the bit on a CNC machine would make. I broke a backsplash while removing it because of the over-cutting that was done by hand to make the duplex receptacle hole. Fortunately this stone was quite forgiving.