Such cancer community, Alicia uses PC because it's easier to stream, get over it. The units moving over each other is something anyone can do, it's called microing, use a pad to play to make it easier if your fat fingers aren't good enough to do it on a small screen.
It's no different to sending your harvester over your units to get away, you can do the same thing with things like predator tanks, have them go to a tile past the first pred tank, this allows you to have them overlap units, i do this all the time with my pitbulls on my phone. This isn't a emulator only thing, if you're not good enough to do it, well as they say, practice makes perfect. Don't lose concentration or tunnel.