Speak directly with ACC, they supplied the ship flat carpets for ECS. I spoke with them years ago and they said they could ship flat but it was going to cost you a premium, I don’t remember what that fee was but I ended up going with their standard boxing to save the money. They explained carpets are made fresh to order and that no issues should be experienced if you open and lay the carpet out immediately upon receipt. I followed the recommendation and really had no issue, I placed it in the sun to warm it up and become more pliable. Biggest issue here was 15 min in the sun on a 115 degree day and I needed to wear gloves to be able to pick it up.