Do I need all 500,000 THB in one bank account for my Thai visa application, and what documentation do I need to submit for my employment as a sole proprietor?

hey all ! going to apply soon, just gathering all the documentation needed. Two questions in regards to two of them! (as i can't get ahold of anyone from the Embassy, i thought I'd give it a shot here):

* financial evidence (500,000 TBH) --> does it need to be sitting in ONE bank account? i have my $ scattered across different accounts, i just wonder if i can submit a few which will end up <500,000...?

* Employment contract - I have my own company (sole proprietorship) and i have one contract with my client. should i submit the contract I signed with my client or submit a slip from the city tax office i am a registered company and i pay taxes?

thanks in advance!