Vent Cover Casing
Create casing/trim for vent covers. This adds aesthetic appeal, but also has a number of practical applications.
If a vent cover screw does not line up with framing lumber the casing acts as a secure hold.
If there are drywall/sheetrock issues, the trim can cover them from view.
Cover Issues
Drywall/sheetrock damage and no framing lumber to secure the vent cover.
Casing
Use door/window casing to create a frame. Or create your own custom casing.