The silver towers is a stupid UFO anyway that actively trolls you. If you do manage to down it, assaulting it on the ground is a major pain; you need flying armor to get inside, it has no engines so there will never be an alternate way in via exploded hole, the layout is nuts, the only loot you get from it are hypno panels and not much else (a battleship provides way more loot than that while being relatively easier to take down), and it's full of high-ranking ethereals that'll mess you up with mind attacks and mind control (and the best counter against them, syns, can't fly to get inside). The only plus side is that there's a guaranteed coordinator since the silver towers is always all ethereal and never the version with the waspites and gazers (if you see them, just flee if you were going for a coordinator because there won't be one), and no engines to blow up means there's no risk of him being dead before the mission starts.