In my current 8.3 game, the 100 or so Teleporter Platforms I managed to parasite, dominate all battlefields.
1) They can be on any planet in seconds, and in action 1 second later
2) They teleport in, shoot, teleport out, wait a few seconds and repeat
3) Shots follow them across the map (and keep following them) but these are easy to evade by teleporting yet again
4) Once too many shots are there, they teleport to another planet and return 30 seconds later
Basically: they are omnipresent and invulnerable.