Yeah, you've got it. But remember that the brake housing is a part of the BALANCED spring tensioning of the arms. It MUST stay stable. If that means you need to tape it to the top tube to hold it in place then so be it. I had one bike that the housing wanted to stretch tight over a few days thanks to the steering curve pulling it through the guides. For some reason this gentle front "pumping?" action left the segment from the last guide to the caliper tight like a violin's G string. Once I taped the housing to the top tube this stopped and I didn't need to pull the housing back anymore. Granted my case seemed extreme but it's just one of life's great mysteries...
Oh, and to help avoid the housing grinding into the paint wrap one turn around the top tube and THEN the next one or two turns holds the housing in place. That way the paint is protected.