Several methods, depending on preference
If you do not plan to remove the nameplates, then superglue
However once in place they cannot be removed and if you later notice they are not level disaster!
Adhesive varnish is a great compromise
It does take a long time to dry, so allow at least 48 hours before touching the model
Complete one side at a time
Unlike superglue if you later notice the nameplate is not level then you can remove, clean both surfaces and repeat
Double sided sticky tape
Trimmed to the correct size, this is the method I use and works perfectly well
However it is not suitable on the smaller plaques and symbols