Basic strategy is the same as for any other high-power shipping - 1 fighter for tanking (with a high REA Lokk'Narr pilot, mandatory), 3 fighters for damage. It's just a question of scale. The problem here is the super fast recharge on the shield. There is no chance of taking it down gradually (unless - you have a fleet of quad-gattling dragons available, but then you wouldn't be asking about tactics
). 3 whalers with avalanche can work, supported by a tanky fighter. Your best bet is taking down the shield (and hull, preferably) in one, huge salvo. 9 avalanches should do it even with crappy dmg rolls. 6 are risky, and you will most likely need to do enough hull damage to crash it in another way. Towers have no armor, so gattling lasers are not a bad choice, as long as you can field a decent number of them and can survive the damage output of the Towers (high power, high accuracy shots with medium delay - about the same as a destroyer). They also have an extremely short disengage window (around 25-30% of what other craft have, even shorter than corvettes), so you damage window is fairly short, unless you use fighters that can keep up (whaler, sabre and nightmare). High bravery pilot(s) are a must for any craft that will need to fight longer than 1 shot from avalanche. Implosion bombs are bad - short range, half shield damage and low accuracy (Towers' dodge bonus). They may be viable (not reliable) as a 'finisher' if you blew the shields, but not the hull - 2 bombs should crash it.
Silver Towers is, in essence, a troll ship. I consider it a last resort - a guaranteed, if challenging, way to get a SG Coordinator.
IF you can survive the land battle as well.