The following type of prints come ready to hang: framed prints, wood prints, acrylic prints, metal prints (with the exception of some styles), stretched and mounted canvas prints and metal prints will arrive ready-to-hang. Some other types of prints may have styles that also allow for them to be ready to hang.
The image is sublimated directly onto the treated surface of the panel using special dye based inks. This makes then smudge proof and not likely to be scratched unless scraped with a hard or sharp object.
This is not recommended. The veneer has a coating which the image has been sublimated to. Some chemicals could potentially harm the surface.
White is not a standard color that is printed. Essentially when an image has pure white, no color is applied to that area. As the colors in an image get darker, more ink is applied. If your image has pure white, it will appear as transparent. That is where the beauty of wood prints come in since your underlying wood pattern becomes more visible the lighter the color.
Softproofing relies on having a consistent white level on the surface of the media the image is being printed to. Since the wood is obviously not white and the hue of the wood can vary slightly dependent upon the age of the veneer, there is no way to profile a wood print.
You should not have do anything other then choose a size that matches as close to your image as possible. Some people will elevate the contrast of an image slightly so that more subtle tones you want to show are not lost to too transparent.