Just get these if you want a spider power meter:
https://www.aliexpress.us/item/3256805672001074.htmlYou can even take off the spider power meter and put it on another 3-bolt direct crankset if don't like the ZRace crankset. These were on sale for $265 USD last week during the sale (plus coupon codes). They cost as much as the Magene power meter sold by itself. Might as well get a free crankset in the process.