As always, follow your manufacturer's directions. If they have to warranty it, they will expect their process to be employed.
The local mayor tinned his own shop roof, using basic labourers. It blew off the first wind, about a month later. It was as screwed through the strapping ok. They had used staples to hold the strapping down and only a few screws poked out beneath.
Using three inch screws on the strapping works for me. I sink two into the meat of the studs at each intersection. If I have double strapping, that's four screws. if the wood is soft, I use four inch on the base layer.
Because sheet goods are not broken up, like shingles, the vacuum pressure can be immense, and staples are not appropriate except for initial placement, for convenience. They won't hold the roof down.
Although I might go 24 to o 36 inches on spacing, I would only do that with heavy tin, where the purloined are four feet apart. On wood, I prefer about 18". If one screw doesn't hold, the space in that location, is 36 inches. . .
No one does that, but I never have to return to fix my work, and there is nowhere that it can flap or move at all.
Consider your substrate, when making sweeping decisions about placement.
Claiming by his labourers were contractors, he filed for insurance, so the whole community is paying to fix his workmanship. So he could play god and starve the real tradesmen. . .
It's like a reward for the negligence, he really does have a knack for government, not construction!
I miss the good old days, when adjusters called us first, then they knew what happened good, bad or indifferent.
I'm pretty sure the lap is almost always screwed together. The manager, us the one who read the instructions, for that product, every time. Whether it's mixing chemicals, overlapping housewrap 12", or here following a recommended pattern.
That's how I learn the right way, the first time, every time.
I probably read the KD instructions 2000 times, until I knew the product and how I wanted to effect that result. If I hadn't mastered their technique first, I wouldn't have a baseline, to improve it yet.