Redis cache on multisites

Hello,

Two question please?

1.Multisite support? if yes, should I networkly activated or only activate it on subsites please?

2.We are using these two plugins to handle server:

https://ww.wp.xz.cn/plugins/nginx-helper/
https://ww.wp.xz.cn/plugins/redis-cache/

Is there any special setup steps to mach Redis cache please?

Thanks.