You can apply for credit cards from three different banks at the same time within one month, but it may be regarded as a malicious application and it is more likely to be rejected.

Applying for credit cards from several banks at the same time has little influence on each other, but in this case, the card issuance rate will have a little influence. Your personal credit record will intensively show the recent credit card approval records of many banks.

If the application for credit card is not approved, please apply again after three months, and it is best to apply in stages, so that the approval rate of card processing is relatively high. For example, the time interval for applying for each card is 3-6 months or even 1 year, so that the credit card approver will look at the credit card usage of other banks. If the credit card usage is better, the credit card limit and card issuance probability can be increased accordingly, which is also the reason why the credit card limit is sometimes higher and higher. Please note that the total number of credit cards should not exceed 7, and it is best to cancel the cards with small amount and bad use.

This is what I learned, I hope it will help you.