That would work fine but I feel guilty for sending you down the 'proper rack' road. They are just way too expensive for home use unless you really want to go that way.

A good compromise might be to build a wooden rack sized to allow you to add the metal shelving. This way you gain the benefit of the mesh shelves for cooling and a lower pricetag. Power and additional fans (if required) can still be custom mounted whereever you need it.

After all, in your situation, this will be out of the way and unseen.

With great power comes Awesome irresponsibility.