Picture the table he uses most. If he would have to move the vase each time he opens a newspaper, choose a different spot.
Check more than the pot on a narrow shelf
Succulent leaves can extend beyond the rim. On a shelf 20 cm deep, the pot diameter alone tells you little. Check the total depth and leave clearance.
For a spot visible across the room
Protea heads have a distinct outline from a distance. Succulents in low metal bowls reward a closer look. Consider a small design beside a reading chair or a wider piece for a broad console.