In the cases where I found the maximum amount of private keys supported, I display it like "YES (3)". For example, Keystone 3 Pro.
I think we are talking about two different things, and I was talking about multiple
seed phrases, not about multiple
private keys.
If I am not mistaken Coldcard devices can only store one seed phrase at the time.
Keystone can store 3 seed phrases in the same time on one device, and Era up to 10 seed phrases.
Maybe you wanted to combine multiple private keys and multiple seed phrases into one category, but this can create confusion.