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I see, so my last input in this will be: I do personally consider "on the board" meaning on the surface where you play, including ups and downs but for e.g. not ruins, buildings & other terrain =P

I will repeat that Fortifications are not 'placed on the board'. They have their own rules and they are deployed.

I quote (page 120, first paragraph):

Fortifications must be set up wholly within the owning player's table half and not within 3" of another fortification.

Those are the only restrictions there are. Since the network lifts the 3" distance requirement there is no reason you couldn't put them on top of each other, as long as it's wholly within your own table half.

Yes, Fortifications are terrain, but they have their own set up rules.

The rulebook is full of sub-types of main types that change the way the type works. In this case fortifications are a sub-type of terrain and they have their own set up rules, so the normal terrain set up rules do no longer apply.

Note that the rules on page 120/121 speak of 'deploying', 'placing', 'set up' without consistency. For instance, on page 120, second column, 4th paragraph (3rd bullet point), it first speaks of deploying a piece of terrain, then the next sentence speaks of 'can be placed anywhere on the board.'
Yet the next page speaks of 'deploying' units (Deploy Force, page 121). Are units and terrain subject to the same restrictions then? May they only be placed on the 'board'? Yet noone disputes that units may be placed/deployed/set up on top of terrain.

The only thing that was stopping us from putting pieces of terrain on top of each other was the 3" distance requirement... (and the terrain density limit).