A neat and easy way to mount a sign to a flat surface is to use a picture plate and bend it at a right angle in the middle to form a bracket .Attatch to the inside edge of the sign using pop rivets and rivet washers both sides

The larger signs can have sturdier brackets fibreglassed in if requested

To fix the signs to square posts I will fibreglass these brackets in at given measurements

The Tray signs are afixed to a batoned wall and screwed top and underneath