Is this section still accurate?
"The packageAUR provides an automated script for setting up such swap devices with optimal settings for your system (such as RAM size and CPU core number). The script creates one zram device per CPU core with a total space equivalent to the RAM available, so you will have a compressed swap with higher priority than regular swap, which will utilize multiple CPU cores for compressing data."
According to the Linux Kernel docs  "ZRAM will always allocate multiple compression streams - one per online CPUs - thus allowing several concurrent compression operations". On the gentoo wiki making multiple devices to get scaling is mentioned as a workaround for pre 3.15 kernels. https://wiki.gentoo.org/wiki/Zram#Caveats.2FCons