This is going to short and sweet, and is meant for those whose boats are at risk from hurricane Matthew. Here are three excellent articles on anchoring techniques.
One that I see as having merit is the tandem anchoring technique.
Don't forget chafe gear, and don't stay on your boat - it can be replaced, and we'd hate to lose you....Good luck, and our prayers are with you during this time.
http://www.sailmagazine.com/cruising/cruising-tips/setting-tandem-anchors/
http://cruising.coastalboating.net/Seamanship/Anchoring/Two_Anchors/index.html
http://www.petersmith.net.nz/boat-anchors/tandem-anchoring.php