I explored this and several others helped. Part of the problem here is math - getting good hardware to support my weight needs steel pad eyes with lots of long screws and successfully hitting the joists in the ceiling, so you need to explore the joists as to how big and thick they are before going out and buying the hardware...I have 2x8 joists in the basement and I don't connect to the same joist. The ones I picked up were from a boating supply - you won't find them at hardware places. The stainless steel pad eye is rated over 600 lbs each. I vaguely remember getting 2" screws and pre-drilling into the joist with a small pilot drill then sinking the screws. To flatten out the hammock my location spread was 26 feet apart. The pad eyes are above the drop ceiling and hidden with a small cut out for the rope to come thru the drop. So when the hammock is put away - nobody would notice in the mult-use room.
Be wise enough to walk away from the nonsense around you!