I've used hot glue to build crossovers for more than 20 yrs and never damaged a component with the heat.
Use the completely clear hot glue it has the lowest melting point. If you need to replace a component it will peel-off most surfaces.
You should be able to find a glue gun locally for $10-$15
If you use epoxy and for some reason need to replace a component you're screwed.
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