Okay let me put your worries at ease here, as those circles (the 3 of em) ARE landing pads.
It has been sited in numerous noncanon sources (novels, schematics, etc...) that the starships known as Romulan Birds-of-Prey can not only enter atmospheres, but also is able to land on planets without any difficulties
Also, don't forget the design itself is a lifting body in its configuration, so that too would lend itself to the idea of the vessel being more than adept enough to land on a planet's surface
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