You'll get rate limited and then banned pretty quickly with these in my experience. Having a real phone and using the strategies you see in clickfarms with emulated input is the best way.
It's fairly easy especially if there is a legacy mobile app for the site. In Instagram's case you just use an older version of the app which works for legacy devices and reverse engineer it. Most the mobile apps have their own API which they connect to, so you just pretend to be the mobile app and you have access to all the features. It also doesn't change much because mostly they can't risk breaking old installs with a high install count. Use a new IP address for each account you manage. Limit the number of actions and randomize it so 30 follows day 1, followed by 2 follows, maybe 10 posts, followed by 3 posts so it's not 3 posts per day every day.
My main issue I've had is a lot of the IPs (like 1 in every 15 or so) I went through were already banned from IG or suspicious enough to block me from posting.
