With a 12 ft. sofa, I think you'll probably need at least a 72" to 100"+ rectangular long table. But then again, a lot of it will depend on how the rest of the living space is laid out.

Depending on whether or not you have 1 or 2 chairs flanking each side of the sofa, you're right....you may need 2 coffee tables.

To help you better, we will need to have a better idea of the layout you have in mind, ie sizes of other pieces and the dimensions of the space/room itself.

In the meantime, here's a Houzz article that can be helpful for you:

[https://www.houzz.com/magazine/how-to-pick-out-a-coffee-table-stsetivw-vs~27686787[(https://www.houzz.com/magazine/how-to-pick-out-a-coffee-table-stsetivw-vs~27686787)

Also, for large coffee tables, check out Restoration Hardware. They definitely have good options for you since many of their sofas are offered in relatively large sizes.....they also offer tables to go along with them. :-)

They do have a few coffee tables that go up to 108" in length.

HI -- The coffee table should be 2 feet shorter than the sofa . You could use two tables to get the length . But there is so much available now so finding a bigger table should not be that difficult .

Not seeing furniture, but maybe double ottomans or look at benches 2 of these would be 108"