How to choose a good and high quality ac filters? I really need it now

Hm..i think you need to find good store with such equipment, and ask for advice from the seller in such a store. Moreover, you can find a lot of useful information in the Internet about it. I think you can read info, for example, about ac-dc switching power supply module https://www.aeps-group.com/pcategory/ac-dc-en/. There are a lot similar tools and you can use it for you