So first, welcome to the boards.
Second, 36 pieces of terrain includes each little fence and shrubbery, doesn't have to be big, and for that matter, doesn't have to be impassable, think hills that can be walked over, but that still block los to the other side.
On to beating the Ortegas, remember that this is,a VP based game, so sometimes you just have to go for your objective and try your best to avoid them, if that won't work:
Pandora:
Don't use her if you can help it. If you wind up using her, take stitched for their fog and have plenty of woes in base contact for martyr. Lelu and Lilitu are great for this, especially in high point games where you can use Doppelganger to link them to Pandora. (copying (0)Link and Unhealthy Relationship and having Lelu and/or Lilitu in base contact with Pandora and Doppelganger.
Lilith
Best master to go toe to toe with Perdita. Use illusionary forest for cover, although Perdita herself ignores magic terrain, so you may still want a stitched. You'll want a full pol of soulstones and a bigger hand via primordial magic. Get Lilith into close combat and cheat and soulstone away.
Dreamer
Start with your nightmares in play so that you can out activate then. Stitched goes first for fog. Save Dreamer for last. More than likely, Perdita will head straight for him. That's when LCB comes out to play. Once again, cheat and soulstone away and hope for a few onslaught triggers.
Zoraida
Not suggested. If you must, keep Zoraida away from them. Obey Papua Loco like there's no tomorrow, use a voodoo doll to cast at him too, the poison will help deliver that one last explosion. Use a big beat stick like mature nephilim without immune to influence so you can use obey to get your extra hits in. Don't forget to magical extension obey with your doll.
Hope that helps