are there clips or similar options for concealed mounting?

I need to attach a 4.3m x 20cm x 16mm MDF board as a cornice 1m up and I want it to stay in place, of course - normally no other weight than its own weight.

is there a good way to attach it?
 
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Vi vill skicka notiser för ämnen du bevakar och händelser som berör dig.