Same with Scampi.. or you may fabricate our own as personally, I don't like anything directly surfaced on the wall. what we usually is we have metal plate (the dimension depends on the number of brushes you would like to hang, e.g. 3 brushes we will use 2in (H) x 12 in (L) metal plate fixed to the wall by means of rod to have a distance of to the wall and the plate of atleast 5cm.. then a hanger same with Scampi's post.
However even if you have that you must cascade or make visual standards/reference on how it should be hanged. Even if use the link attached, if your bristle is facing the wall, more likely it will still have contact, so the visual must be the bristle should always face opposite the wall..Not necessarily enclosed.
On 2nd point, the food contact and non food should not come in contact with each other :)