I made this simple design to hold my Matek f405 Wing in my AR Wing 900. You can use it to mount whatever you want in your wing.
It is designed to work with a 2mm plate but you can sand the holders down to the size you want. Also since the wing is out of foam you need to sand down the holders a bit to give you a tight fit but no forces on the carbon spar. You can use two little screws to hold the front part of the plate to the glued in wood. If the spar wont fit the holes just sand them a bit wider.
there is a pivot hole in the bottom which you have to drill to a 2.5mm hole and then use a M3x10 screw to mount the holders to your plate.