How to minimize the effects of under-eye filler treatment (improving sagging) and aftereffects such as bruising

As I get older, I have sagging under my eyes and am considering getting filler.
The skin around my eyes is thin, so I have concerns about the effectiveness and safety of the procedure, especially the aftereffects such as bruising, so I would like to get more detailed information from the medical staff.

Q. If sagging and sunken areas under the eyes are improved with filler treatment, what are the expected results and how long can they last?
Q. Considering work, is there a specific type of under-eye filler that reduces the risk of bruising and swelling after treatment?