Try double sided sticky stuff (or tape). I haven't used it for this, but the stuff can be very useful on a layout.
https://smile.amazon.com/gp/pr...00?ie=UTF8&psc=1
BTW, the "smile" on Amazon allows you to contribute to a charity at no cost to you. Amazon contributes a small portion of every sale. My charity is the NJHR (technically, the Northwest Jersey Hi-Railers, Inc.). We gladly welcome anyone who would like to contribute to our club at no cost.
Gerry