Keep floor plants beyond chair movement and use smaller flowering pots on a sideboard rather than across the eating surface. Check whether curtains are normally open outside meal times. Water and drain the pots away from table linen before returning them to the display.
The message behind the grouping
Meaning, with a little thought.
A canopy and a restrained flower accent can communicate hospitality. The planting should support conversation and the use of the room, not become a barrier between diners.