More than likely sheet planks. They did not have a spare. No gaps that I’ve noticed from the inspection. I tested, tested, and tested again. Before putting anything down.You said it's plank but are you sure it's not sheet??
If there's any gaps or shrinkage in the planks at all be very leery and care for running a turbo spinner at 700 plus PSI especially on the newer products that have bonded cushions underneath as they can swell if they get too much water
Try and run a 400 psi floor wand as often as possible
Last time I used a gecko, that thing made me feel like I had to replace my shoulder. The vacuum stuck to the floor and was a pain to pull.I'll be the first to buy whatever you come out with. Hurry up! I used my WP tile wand all day yesterday and I'm burned out trying to pivot it in places that really need a good tile wand