I would look at hangouts.com I have had three L. mayan hammocks from them. They are out of Boulder CO.
I would guess that 9' is not enough. Unless your anchor points are much higher, like ceiling level. IMO I would not settle for anything less then the large they are supremely comfy and you can get the whole family in them. I bolts into the ceiling rafters are bombproof. No stand required.
My anchor points are currently 3.66m apart and 203cm off the ground.