Definitely makes sense for political markers, which are only placed in War Phase segment 2, Political Alignment Segment (7.3).
Military markers are placed in Decision Segments 4 and 5. I'm guessing your intent is that segment 4, Production Allocation should be used for placement of all military markers. Section 6.5 Military Support reads "Place each offensive support purchased in this way in the entry space of any Front. Place each naval support marker in a theater box."
There's no instruction on when to place offensive markers not purchased by production markers, but that's unnecessary since any staff cards that give offensive markers tell you where to place them. (I'm guessing those markers are placed immediately?)
I had been reading 6.5 as a description of one of the uses for production markers described in 6.4-6.8, and not a phase of the game per se.
It has no impact when you place them as there is no axis player to hide them from. I was primarily commenting on the political marker. You can place naval immediately.