if they see there is a spitting then they sum all transactions of the month. It shouldn't be over
*****
euro.
You can split it in 2 months. It works. The problem is that a split in 2 months cost you valuable time within 3 months of your non immigrant o Visa .
Example: you enter Thailand in July with 3 months Visa. You go to immigration and get a residence certification then you go to bank and open and account. If you split it in two months you will do it in July and August. Then you will wait from x of August to X of October but your visa is untill September. You can only extend your visa for another 1 month in order to fulfill the requirement of having 800 000 baht for two months.( At some immigration office 3 months) .
Then imagine how difficult would it be for you.