We have a group of 10. The morning our ADR window opened, we were ready - first we went after an ADR for 10 at BOG for lunch (second to last park day) and then CRT lunch a couple days earlier. We were successful for both, but after about twenty minutes there was really no availability left. We had made plans to move days, then drop people, etc. to try to get an ADR for the group but luckily we only had to wake up at 5am local time (ugh).
If you're traveling in the near future, I don't think doing two reservations is a bad idea, but be prepared to split. Check as often as you can (or pony up for the ADR sniper) to try to consolidate. I've heard a lot of things open up the closer you get so that might be a way to do it also...just sort of wait it out and try (especially the day before or morning of).