No chance. Just get a 'firing squad' of 3 crack soldiers, 2 with Heavy Plasmas and 1 with a Heavy Laser, about 5 normal soldiers (Laser/Plasma rifles), give them all Power Armour and also have, as Tom said, about 10 Laser Tanks in your own base.
Two Rocket tanks can cause one hell of a mess in your own base, which is never a good thing. If you want raw killing power, get XComUtil and give all of your soldiers HE packs. They are bumped up to 200 damage, enough to kill any alien who thinks that they can sort you out.
Even a Sectopod is no match for this!
Also, Terror Sites are no place for blind-firing high explosives everywhere. You want to REDUCE civilian casualties, or at least let them all die and make an incredibly lethal crossfire with your soldiers that no alien could possibly live through after they come for you.
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