Booster Box Pull Rates?

So I am debating pre-ordering a few boxes of the cosmic eclipse and was wondering if there is a confirmed pull rates for modern booster boxes. I have seen comments and post about pull rates from modern booster boxes, but they all seem to be speculative and based on experience and not confirmed posted pull rates. Do all the modern booster boxes have the same pull rate with a specified amount of Secrets, Ultras etc., and is there a site or place I am missing that shows this information? (Sorry if this is an obvious known answer, but I am yet to buy much modern product and was not sure of the answer)

The only thing confirmed is the 1:3 ratio for a ‘premium’ card, with premium in this case being anything from a rare holo to a secret rare. And even then, sometimes you get 11 ‘holos’ in a booster box and sometimes you get 13.

The best advice I can give you is to watch some (sealed) booster box unboxings on YouTube and note down the pulls; That’s about as accurate of information you’re going to get. Skip the ones that don’t show the sealed box (and just 36 boosters loose), as they might muddy up the information, when the boosters are not from the same box.

There are no confirmed pull rates on ultra rares. I’ve seen from 2 to 10, but expect 5-6.