No recommendations???

Where are you planning for your expansion breaks? Start there. You can’t run all of that continuously without thresholds and gaps for expansion. You’ll get an unholy buckling separating mess that isn’t warrantied. Same with the industry standard required floor prep. You have to get the floor flat within 3/16” in 10 first. Grind down high spots and fill the low spots. A week or two of that, and figuring out the expansion breaks, and you’re ready to begin.

I was told the whole floor could be done without expansion thresholds (up to 6000 sq Ft). I am looking for someone to level out the floor properly first.