I've been a fan of the Siberian Hitch, but it may have to be replaced by the Slipped Figure Eight Noose (ABOK #1116) on my favorites list. My brief testing shows that a Slipped Fig8 Noose is better as an anchor hitch. The Slipped Fig8 Noose tends to capsize into a tight, secure, acceptable dressing. In contrast, on wide objects, the Siberian Hitch tends to capsize into a dressing that is open and quite different than the original dressing, making me uneasy.

Siberian Hitch

Fig8 Noose (ABOK #1116),
BUT ADD A SLIP