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Tunze sells a $50 "adapter" that allows you to hook up their pumps to any 12 volt battery. The pumps already run on 12 volts converted from 110 volts. So, it should be a fairly straightforward battery backup setup. I was planning to tie into a large marine battery I have as a sump battery backup because it is constantly trickle charged.
I recently purchased a used mp40 1st gen Vortech pump. I must say not completely sold on it yet, I have a wave and great water movement but it seems a little noisy. Their customer service is great however,I needed a replacement cover and o-ring and received them freewithin a couple of days after getting in touch w/ them. Never owned a Tunze but dont like their size (too large) thats why I replaced my Koralia pumps.
I have 2 tunze and don't see the need for a wave box. Setting the high them to pulse from 0% to 100% alternating will wash water right out of my tank, the wave it makes is amazing. I cant see a wave box doing much more. One pro for the vortechs is the space they take up inside the tank, tunzes are huge