Adding glue does nothing to help the nutserts hold, if they are installed correctly.
The image is showiing stainless steel nutserts into stainless steel.
Bikes usually have aluminium ones as they are easier to set.
I have nutserts, setting tool and a 7.1mm drill if you fancy doing it yourself? 7.1 mm is the size for M5 nutserts. (rivnuts is an americanism).