Cat Food for adult F5, and pre-purchase questions

I read on the net that both wet and dry food is the best. However many of these sites are from breeders or targeted toward kittens. The Savannah I'm considering is 4 or 5 years old, a retired adult from breeder. I think it's a reasonable fit for me. My wife is very experienced in general cat care, but not savannahs specifically. Because this adult cat is coming from a breeder, she currently eats all canned. I cannot sustain that diet. I suspect all their cats get a similar diet, excluding kittens, just for logistics sake. So the internet has me believe that a mixed diet is the norm. But I realize an F5 cat is quite a distance from its serval roots, closer to a regular tabby, than a serval. It makes me wonder if a tabby can eat kibble style on a timer, at what generation can a Savannah do the same?

What are some other questions that I should be asking the breeder. They say it's Tica registered, but when I pushed for genetic testing papers those seem to be more difficult. I may contact different breeders offering Retired cats to see what docs they can readily supply. I'm told breeders often don't keep good records.

In addition what are some other things I should be looking for/asking?