Superglue ok?

Ta

Yep, should do. if not a 2 part epoxy like Araldite should do it

Personally I’d use (and I have used) number plate mounting double sided tape. It makes the badge stick out slightly which looks cool, it is extremely secure but you can still pull it off if you want to respray or do a repair or something. Plus I have some in the garage.

I came here to say doulbe sided carpet tape for many of the same reasons as molgrips.

number plate mounting double sided tape

This, or similar.

Yep, as above, sticky backed tape. I like the thicker slightly foamy stuff as it fills gaps well