Is “the most amount of {countable things}” ever an acceptable replacement for “the greatest amount of {countable things}”?
the most amount appears to have become sort of idiomatic expression in recent decades.
From The Book That Real Estate Agents Don't Want You to Read!
You need to get the most amount of potential buyers looking at your property within the shortest amount of time, and that is the only way to guarantee you can make that second trip to the hardware store –
From How to Shake the Money Tree By Joe French
I always use my money sparingly, so that I can get the most amount of items, for the least amount of money.