Administering a large number of WordPress sites?

Question

WordPress

There are about 20 WordPress sites, all on different hosts, from small ftp-only packages to VPS. It is necessary to somehow organize administration, update the core and plugins, copies.
What I already found:
wp-cli.org - as I understand it, ssh is needed or am I wrong?
mainwp.com - sites must be on the same xsoting or?
Thank you very much in advance!

Answer 1

wordpress.com connect via jetpack
get the following picture, from there and shamanize

Answer 2

InfiniteWP .