Tee nuts are usually put on the bottom of the playfield to hold stuff on top, not stuff on the bottom of the playfield, there are a few acceptions. If I have some stripped holes on the bottom of a playfield, sometime I will upsize the thickness of the screw, not the length obviously, from #6 to #7 or 8. I have used #10 a few times but they require enlarging the holes in the item being mounted. Proximity to the edges of the playfield and cutouts is a concern, and I mark in pencil next to each enlagred hole so I know which size screw goes there .
If you don't want to upsize, glue and boo works.'