We have anchored may times in Eustatis Sound, mostly in the long cove shown near the top of this
photo.

Plenty of
water and safe if you can read the
water depths.
Also suggest Benures or Soldiers Bays, Norman Island, Key Cay on the south side of Peter Island,
Salt Island off the "village" if the
wind is in the southeast, Sandy Spit/Green Cay area east of Jost Van Dyke.
Other
anchorages that are recommended day stops often clear out in the afternoon and can be fine overnight spots if the
weather is moderate and/or you are on a
catamaran.
Just remember that there are no "unknown" anchorages in the BVIs but its not necessary to
anchor on top of other boats every night.
Enjoy!