Just returned from BSA campout and wanted to share my experience with suspending my hammock from a rock wall. I slept 9.5 hours with nary a slip in suspension.
I used Black Diamond climbing nuts #13 with redundant #10 at one end and #12 (as cam) with redundant Bluewater 6mm accessory cord and ring over natural horn anchor. Planning on getting another #12 so can suspend with double redundancy safeties (two nuts and accessory cord at each end). Camp Nano 'biners, 5mm accessory cord sling (on left with purple nut), and orange whoopie slings complete the picture.
I never got cold - Hammock VPL was 2 person emergency blanket (not shown), CCF pad, +15 Kelty bag in MSS gortex bivy sack. Got too hot after 4 hours and got out of bivy sac and lay on it with sleeping bag as top quilt.
Next BSA campout - Death Valley group site- no trees, no rocks.