Stick with one bottle for now and if ur baby doesn’t fully bf or dislikes this specifc type then buy something different. It’s good to have a bottle anyway cos u might not be able to bfeed immediately or find ur supply is low or maybe u want to pump all ur milk and feed thru the bottle… loads of reasons… it’s just good to have backup.
Also, i think it would be a hassle of u bought a bunch of bottles and ended up not using them or finding something else that works for ur baby.