The funds can be in any number of accounts but they should add up to atleast the minimum stated requirement. It’s just easier if it’s not split into too many accounts. Try to maintain the balance (for e.g. if it’s your savings account then monthly balance should either be roughly same or increasing steadily) which tells them that you suddenly didn’t get large influx of money (e.g. you didn’t borrow it from someone etc.). This minimum balance should be maintained for about the past 3-6 months, both during the application as well as during the landing, as they may ask for proof of funds during landing (they didn’t ask me for it during the landing).
It helps to get a official summary letter from your bank which states all details, and possibly a cover letter for funds written by you that adds up all the numbers for the visa officer’s convenience.