I have 2 cabinets that I want to use as a kitchen Island. They will be 4'x2' when put back to back.

I want to put a 4'x5' counter on the top so there is a 1' overhang on 3 sides.

So...I need to securely attch the cabinets to a floor that is porcelain tile on a cement slab. I know I need to build a frame and attach the cabints to it. However my dilima is how to attach that frame to the floor.

I have no clue how to go about doing this. In my research I came up with 3 methods.

Attach with construction adhesive. That sounds the easiest, but will it be strong enough?

Use tapcon screws. Sounds ok, but its my understanding the porcelain tile will be very hard to drill through. Plus I don't have a hammer drill?

Use a remington nail driver and shoot the nails through the 2x4, tile and into the concrete. This sounds a little crazy... Will this be able to go through the porcelain tile. Looking at them at HD, the nail was 2-1/2" long. So only about an 1" would be in the tile/concrete. Is this enough to secure it?
Will this shatter the porcelain tile?

Thanks!