Hot glue on the inside of the cover will work. I reserve hot glue for ornamental fixes only, not for structure or used for as a substitute for a good wood glue.
The covers I used had tabs that I bent back, but they rattled. Pulled em back off and used a toothpick to apply small bead of clear caulk under rim, just enough to hold. Working great now.
i use a hot glue gun unless they fit tight.some drain covers have tabs on them and you can just bend the tabs on the inside of the box to hold them in place. the hot glue gun is real inexpensive and works really well.
Liquid Nails also has a "general purpose" adhesive that works well / sets relatively fast. It's not clear but used in moderation will stick most anything. Oh yeah, it's cheap and can be found at Wally-World.
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