In alt.home.repair, on Sun, 19 Apr 2020 10:19:46 -0700 (PDT),
wrote:

The wall plates are stainless, should I glue or
try to solder the screw-heads in place on the wall plates ?

Glue for sure. Even if it would stick, a whole wall plate is one big
heat sink that would be hard to get hot enough. Glue is so easy. If
it's just the screw heads, 5-minute epoxy on the back of the plate,
grabbing the end of the screw, maybe a little bit going up 2 or 3
threads.