If I have the measurements correct, the DR table could go either direction. With 36”x72” table for 6, and 9x12 rug, you have 4’ on both sides of rug for side board, extra DR chairs, etc. With the table turned 90*, you have room for 36”x96” table for 8, and 10x14 rug, with 30” (sufficient) of rug showing around the table to pull out the chairs, and sufficient room along the wall for a side board.
Q