If you have no woodworking skills, the MagBlok is pretty much the standard for magnetic strips:
http://benchcrafted.com/Magblok.html
I don't understand the 12 inch size, I wonder what percentage of sales this size takes? It's just too small to justify purchasing and installing when it can hold maybe 6 knives and I bet it's more like 4-5 if you want room between the blades. I would get two also and mount them end to end to a contrasting board which would give you more clearance from the wall.
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